2-Amino-5-Chloro-N,3-Dimethylbenzamide

Endpoint summary

Description of key information

1. In the KeratinoSens assay “In Vitro Skin Sensitisation: Keratinocyte-Based ARE-Nrf2 Luciferase Reporter Gene Test of 2-Amino-5-Chloro-N,3-Dimethylbenzamide Using KeratinoSensTM (HaCat) Cell line” 2 -Amino-5 -Chloro-N,3 -Dimethylbenzamide met all the evaluation criteria to be concluded as a non-sensitiser. Negative and positive controls met the acceptance criteria for the controls and were correctly identified as non-sensitiser and sensitiser, respectively. All criteria for a valid study were met.

2. From the results of the study “In Chemico Skin Sensitisation: Direct Peptide Reactivity Assay (DPRA) of 2-Amino-5-chloro-N,3-dimethylbenzamide using Synthetic Heptapeptides”, under the specified experimental conditions, 2-Amino-5-chloro-N,3- dimethylbenzamide was identified as a Negative in the DPRA assay.

From the results of these studies under the specified experimental conditions, 2-Amino-5-Chloro-N,3-Dimethylbenzamide is predicted to be a non-sensitiser to skin.

Key value for chemical safety assessment

Skin sensitisation

Link to relevant study records

Reference

Reference 1

Endpoint:

skin sensitisation: in vitro

Type of information:

experimental study

Adequacy of study:

key study

Study period:

30 January to 16 May 2020

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 442D (In Vitro Skin Sensitisation: ARE-Nrf2 Luciferase Test Method)

Version / remarks:

25 June 2018

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: EC No. 440/2008, L 112, method B60: In Vitro Skin Sensitisation: ARE-Nrf2 Luciferase Test Method

Version / remarks:

14 February 2017

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of study:

direct peptide reactivity assay (DPRA)

Justification for non-LLNA method:

The test system used for the in vitro KeratinoSensTM assay was KeratinoSensTM (HaCaT) cell line, an immortalised adherent human keratinocyte cell line. The cell line contains the luciferase gene under the transcriptional control of a constitutive promoter fused with an ARE element from a gene that is known to be up-regulated by contact sensitisers. The KeratinoSensTM test method has been validated by EURL ECVAM and considered scientifically valid to support the discrimination of skin sensitisers and non-sensitisers for the purpose of hazard identification

Specific details on test material used for the study:

Test Item Name: 2-Amino-5-chloro-N,3-dimethylbenzamide
CAS Number: 890707-28-5
Batch/Lot Number: 628-042-00
Active Ingredient Content: 99.0%
Physical State: Beige Solid
Molecular Weight: 198.65
Date of Manufacture: 16 October 2019
Date of Expiry: 16 October 2021
Storage Condition:
As per the instruction received from the Sponsor on storage of the test item, the test item was stored:
Storage Temperature: Room temperature (15 to 30 °C)
Storage Condition: Cool and dry conditions
Storage Container: In original container as supplied by the Sponsor

Details on the study design:

DETAILS OF TEST SYSTEM
- The genetically modified HaCaT cell line (KeratinoSensTM) obtained from Givaudan Schweiz AG
- The KeratinoSensTM cell line contains a stable insertion of the luciferase gene under the transcriptional control of a constitutive SV40 promoter fused with an antioxidant response element (ARE) of the human AKR1C2 gene
- Source: Mutagenicity section, Jai Research Foundation, India
- Cell line Lot No.: JRF/HaCaT/2016/01

VEHICLE
- Dimethyl sulfoxide (DMSO)
- . 2-amino-5-chloro-N,3-dimethylbenzamide was found to be soluble in dimethyl sulfoxide, at the concentration of 200 mM. Hence, dimethyl sulfoxide was selected as the vehicle for this study.

NEGATIVE (SOLVENT) CONTROL: yes
DMSO was used as the concurrent negative control for each set of experiments.
Name: DMSO
CAS Number: 67-68-5
Manufactured by: Qualigens
Lot N°: 3491020519
Retest Date: May 2024
Appearance (Colour): Colourless Liquid
Assay: 99.95%
Storage: Room temperature

POSITIVE CONTROL USED: yes
Trans-cinnamaldehyde was used as a positive control for which stock concentrations from 0.4 to 6.4 mM were prepared in DMSO, which were further diluted to achieve final concentration of positive control ranging from 4 to 64 µM.
CAS Number: 14371-10-9
Manufactured by: Sigma Aldrich
Batch N°:STBF4119V
Date of Receipt: 06 October 2015
Date of Expiry: 05 October 2020
Appearance (Colour): Light yellow liquid
Purity: 99.4%
Storage: 2–8 °C
Density: 1.05 g/mL

NUMBER OF REPLICATES, APPLICATION DOSE AND EXPOSURE TIME
- KeratinosensTM (HaCaT) cells were exposed to 2-Amino-5-Chloro-N,3-Dimethylbenzamide at concentrations: 0.98 µM to 2000 µM
- KeratinosensTM (HaCaT) cells were exposed to Positive control (Trans-cinnamaldehyde) at concentrations: 4 to 64 µM.
- KeratinosensTM (HaCaT) cells were exposed to Negative control (DMSO)
- Cells were incubated for 48 ± 2 hours in 5 ± 1% CO2 at 37 ± 1 °C. After incubation, cells were analysed for luciferase activity.
- Cell viability of the concurrently treated cells was also evaluated using the MTT test with a separate set of plates.
- For each test item and positive control, one experiment consisting of at least two independent repetitions, each containing three replicates of each concentration.
- Each independent repetition was performed on a different day with fresh stock solutions of chemicals and independently harvested cells.

Positive control results:

Luciferase activity induction obtained with the positive control, trans-cinnamaldehyde, was found to be >1.5 (the threshold value) at concentrations of 32 µM, and 64 µM in both repetitions. The induction for positive control at concentrations of 32 µM and 64 µM was found to be 1.77, and 2.85 µM in experiment 2 and 1.57 and 2.19 µM in experiment 4, respectively. The EC1.5 for positive control was 20.11 in experiment 2 and 28.15 in experiment 4. The average gene induction for positive control at 64 µM was found to be 2.85 and 2.19 for experiment 2 and 4, respectively (which was within the guideline acceptable limits of 2 and 8). A clear dose response, with increasing gene induction at increasing dose, was observed for trans-cinnamaldehyde in experiment 2 and experiment 4.

Key result

Run / experiment:

other: Imax

Parameter:

other: Luciferase gene induction

Remarks:

Imax: maximal fold gene-induction (Imax) value observed at any concentration of the test item and positive control.

Value:

1.14

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of skin sensitisation

Remarks:

KeratinoSensTM Prediction: Non-Sensitiser

Key result

Run / experiment:

other: EC1.5

Parameter:

other: Luciferase gene induction

Remarks:

EC1.5: value representing the concentration for which a gene induction above the 1.5-fold threshold.

Value:

2 000

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of skin sensitisation

Remarks:

KeratinoSensTM Prediction: Non-Sensitiser

Key result

Run / experiment:

other: IC50

Parameter:

other: Cellular viability

Remarks:

IC50: concentration value for 50% reduction of cellular viability.

Value:

2 000

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of skin sensitisation

Remarks:

KeratinoSensTM Prediction: Non-Sensitiser

Key result

Run / experiment:

other: IC30

Parameter:

other: Cellular viability

Remarks:

IC30: concentration value for 30% reduction of cellular viability.

Value:

1 571.2

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of skin sensitisation

Remarks:

KeratinoSensTM Prediction: Non-Sensitiser

Other effects / acceptance of results:

OTHER EFFECTS:
- Visible damage on test system: no

ACCEPTANCE OF RESULTS:
- Acceptance criteria met for negative control: yes
- Acceptance criteria met for positive control: yes
- Acceptance criteria met for variability between replicate measurements: yes

Negative Control

The coefficient of variation observed for the negative control, during experiment 2 and 4 for 2-Amino-5-Chloro-N,3-Dimethylbenzamide was 11.11% and 12.01%, respectively, which was below 20%. Since variation amongst the replicates was less than 20%, results of this run were considered as valid.

 

Luciferase Activity

The maximal average fold induction of luciferase activity (Imax) following treatment with 2-Amino-5-Chloro-N,3-Dimethylbenzamide was 1.14, which is less than the 1.5-fold increase required for a positive result. The EC1.5 mean values, representing the concentration where induction of luciferase activity is above the 1.5 fold threshold (i.e 50% enhanced luciferase activity), for 2-Amino-5-Chloro-N,3-Dimethylbenzamide were >2000 µM and there was no dose dependent increase in luciferase induction

 

In Vitro Skin Sensitisation: Keratinocyte-Based ARE-Nrf2 Luciferase Reporter Gene Test of 2-Amino-5-Chloro-N,3-Dimethylbenzamide Using KeratinoSensTM (HaCat) Cell line.

 

Mean Summary of Luciferase Activity Induction and Cellular Viability Values:

I_max(Maximal average fold induction of luciferase activity):

Test Item	Rep2	Rep4	Average
2-Amino-5-Chloro-N,3-Dimethylbenzamide	1.02	1.27	1.14
trans-Cinnamaldehyde	2.85	2.19	2.52

EC_1.5(Concentration for which induction of luciferase activity is above the 1.5-fold threshold:

Test Item	Rep2	Rep4	GeoMean
2-Amino-5-Chloro-N,3-Dimethylbenzamide	>2000µM	>2000µM	>2000µM
trans-Cinnamaldehyde	20.11	28.15	23.79

IC₅₀(Concentration value for 50% reduction of cellular viability):

Test Item	Rep2	Rep4	GeoMean
2-Amino-5-Chloro-N,3-Dimethylbenzamide	1831.78µM	>2000µM	>2000µM

IC₃₀(Concentration value for 30% reduction of cellular viability):

Test Item	Rep2	Rep4	GeoMean
2-Amino-5-Chloro-N,3-Dimethylbenzamide	1403.00µM	1759.55µM	1571.20µM

Rep = Repetition/Experiment – each comprising 3 plates.

Values shown for each repetition are the mean values of 3 replicates.

IC₅₀and IC₃₀cannot be determined for positive control.

In Vitro Skin Sensitisation: Keratinocyte-Based ARE-Nrf2 Luciferase Reporter Gene Test of 2-Amino-5-Chloro-N,3-Dimethylbenzamide Using KeratinoSensTM (HaCat) Cell line

 

Summary of Mean Luciferase Activity Induction Values (Mean of Two Repetitions /Experiments):

2-Amino-5-Chloro-N,3-Dimethylbenzamide(µM)	Fold Luciferase Activity Induction
	Mean	SD
0.98	1.14	0.18
1.95	1.10	0.22
3.91	1.07	0.29
7.81	1.00	0.25
15.63	1.04	0.24
31.25	1.08	0.16
62.5	1.04	0.18
125	1.00	0.11
250	0.85	0.17
500	0.82	0.08
1000	0.80	0.04
2000	0.51	0.24

Cytotoxicity Assessment

Toxicity was observed, as cellular viability was below 70%, at a concentration of 2000 µM. Cellular viability was 53.78% at the tested concentrations of 2000 µM.

 

Interpretation

For 2-Amino-5-Chloro-N,3-Dimethylbenzamide, four experiments were conducted and out of these, two valid experiments (experiment 2 and 4) were considered for the final evaluation. The reason for conducting the repeat experiments was due to the variation between each replicates of test item and failure of positive control to meet the acceptance criteria in experiment 1 and experiment 3, respectively (results of experiments 1 and 3 are on file but not included in this report).

The mean results are summarised below:

Test Item Name	Luciferase gene induction		Cellular viability		KeratinoSens^TM Prediction
	Imax	EC1.5	IC50	IC30
2-Amino-5-Chloro-N,3-Dimethylbenzamide	1.14	>2000µM	>2000µM	1571.20µM	Non-Sensitiser
Positive Control (Trans-Cinnamaldehyde)	2.52	23.79	-	-	Sensitiser

Results of this KeratinoSensTM assay indicate that 2-Amino-5-Chloro-N,3-Dimethylbenzamide met all the evaluation criteria to predict that it is a non-sensitiser in this test. The negative and positive controls met the acceptance criteria and were correctly identified as the non-sensitiser and sensitiser, respectively. This showed the suitability of the test system and procedures used.

Interpretation of results:

GHS criteria not met

Conclusions:

From the results of this KeratinoSensTM assay, under the specified experimental conditions, 2-Amino-5-Chloro-N,3-Dimethylbenzamide is predicted to be a non-sensitiser to skin according to EC regulation 1272/2008 (CLP).

Executive summary:

This study was conducted to evaluate the skin sensitisation potential of 2-Amino-5-Chloro-N,3-Dimethylbenzamide, by assessing keratinocyte activation, using a on Keratinocyte-Based ARE-Nrf2 Luciferase Reporter Gene method, as recommended by the OECD Test guideline 442D.

2-Amino-5-Chloro-N,3-Dimethylbenzamide was found to be soluble at 200 mM in dimethyl sulfoxide (DMSO). Therefore DMSO was selected as a vehicle. The test item was tested in two independent experiments. KeratinosensTM (HaCaT) cells were exposed to 2-Amino-5-Chloro-N,3-Dimethylbenzamide at concentrations of 0.98 µM to 2000 µM, to the positive control (trans-cinnamaldehyde) at concentrations of 4 to 64 µM or to the negative control (DMSO). Cells were incubated for 48 ± 2 hours in 5 ± 1% CO₂at 37 ± 1 °C. After incubation, cells were analysed for luciferase activity. Cell viability of the concurrently treated cells was also evaluated using the MTT test with a separate set of plates. The Imax, and EC_1.5value was calculated based on luciferase activity, i.e., luminescence measured (reading of three plates) while IC₅₀and IC₃₀were calculated based on results of cytotoxicity (OD values, reading of one plate).

Test Item Name	Luciferase gene induction		Cellular viability		KeratinoSens^TM Prediction
	Imax	EC1.5	IC50	IC30
2-Amino-5-Chloro-N,3-Dimethylbenzamide	1.14	>2000µM	>2000µM	1571.20 µM	Non-Sensitiser
Positive Control (Trans-Cinnamaldehyde)	2.52	23.79	-	-	Sensitiser

2-Amino-5-Chloro-N,3-Dimethylbenzamide met all the evaluation criteria to be concluded as a non-sensitiser in the KeratinoSens assay. Negative and positive controls met the acceptance criteria for the controls and were correctly identified as non-sensitiser and sensitiser, respectively. All criteria for a valid study were met, as described in the study plan.

From the results of this KeratinoSens assay, under the specified experimental conditions, 2-Amino-5-Chloro-N,3-Dimethylbenzamide is predicted to be a non-sensitiser to skin.

Reference 2

Endpoint:

skin sensitisation: in chemico

Remarks:

direct peptide reactivity assay

Type of information:

experimental study

Adequacy of study:

key study

Study period:

18 December 2019 to 19 May 2020

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 442C (In Chemico Skin Sensitisation: Direct Peptide Reactivity Assay (DPRA))

Version / remarks:

June 18, 2019

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of study:

direct peptide reactivity assay (DPRA)

Justification for non-LLNA method:

This assay assesses the covalent binding potential of the test item to proteins.” The DPRA is proposed to address the molecular initiating event of the skin sensitisation AOP, namely protein reactivity, by quantifying the reactivity of test chemicals towards model synthetic peptides containing either Cysteine or Lysine. Cysteine and Lysine percent peptide depletion values are then used to categorise a substance in one of four classes of reactivity for supporting the discrimination between skin sensitisers and non-sensitisers.

Specific details on test material used for the study:

Test Item Name 2-Amino-5-Chloro-N,3-Dimethylbenzamide
ADAMA Substance Code: M198
Batch/Lot Number: 628-042-00
Analysed Concentration: 99.0%
(Refer Certificate of Analysis in APPENDIX 5) Physical State: Beige Solid
Date of Manufacture: 16 October 2019
Date of Expiry: 16 October 2021
Storage Condition (at JRF): As per the instruction received from the Sponsor on storage of the test item, the test item was stored:
Storage Temperature: Room temperature (15 to 30 °C)
Storage Condition: Cool and dry conditions
Storage Container: In original container as supplied by the Sponsor
Storage Location: Test Item Control Office, JRF

Details on the study design:

INSTRUMENTS AND EQUIPMENT
Micropipettes: Brand, Eppendorf AG
Refrigerator: LG Electronics Inc.
Digital Balance: Ohaus (Capable of measuring 10 mg to 210 g)
Microbalance: Rodwag (Capable of measuring 1 mg to 5 g)
pH meter: Thermo Scientific
Cyclomixer: Remi Electrotechnik
Millipore Water
System :Millipore
High Performance Liquid
Chromatography (HPLC): Shimadzu
Ultralow Temperature
Freezer: SANYO

DETAILS OF TEST SYSTEM
- Synthetic heptapeptides containing either Lysine (Ac-RFAAKAA-COOH) or Cysteine (Ac-RFAACAA-COOH) are used as the test system for the direct peptide reactivity assay.
- Synthetic heptapeptides used in this study were obtained from RS Synthesis, Louisville, KY 40270, USA. - Batch number of Cysteine and Lysine peptide was P181203-LC180433 and P170906-LC107617, respectively.


SOLVENT CONTROL: yes
i) Acetonitrile
CAS Number: 75-05-8
Manufactured by: Finar
Lot N°: 292761121FS
Date of receipt: September 24, 2019
Date of Expiry: May 2024
Appearance: Colourless Liquid
Purity: 99.1%
Storage: Room Temperature

Dimethyl sulfoxide
CAS Number: 67-68-5
Manufactured by: Qualigens
Lot N°: 3491020519
Date of receipt: May 2019
Date of Expiry: May 2024
Appearance: Colourless Liquid
Purity: 99.95%
Storage: Room Temperature

POSITIVE CONTROL USED: yes
Cinnamaldehyde was used as positive control (PC) at a concentration of 100 mM in acetonitrile.
Name: Cinnamaldehyde
CAS Number: 104-55-2
Density: 1.049 g/mL
Manufactured by: Sigma-Aldrich
Lot N°: MKBT8955V
Date of receipt: February 12, 2016
Date of Expiry: February 2020
Appearance: Yellow Liquid
Purity: 99.1%
Storage: Room Temperature
Note: 38.10 µL of cinnamaldehyde was dissolved in 2961.90 µL of acetonitrile for the preparation of 100 mM solution (3 mL) for both Cysteine and Lysine peptides.

VEHICLE
The test item was found to be soluble in 1:9 mixture of dimethyl sulfoxide: acetonitrile after 1 minute of sonication at 100 mM, therefore, 1:9 mixture of dimethyl sulfoxide: acetonitrile was selected as the vehicle for this study. Precipitation was not observed in 1:9 mixture of dimethyl sulfoxide: Acetonitrile. Hence, 1:9 mixture of dimethyl sulfoxide: acetonitrile was selected as the vehicle for the experiment.

Positive control results:

Cinnamaldehyde was used as positive control in each assay with Cysteine and Lysine peptides. Value of the mean percent peptide depletion value of the positive control, viz., cinnamaldehyde was 86% for cysteine peptide and 68% for lysine peptide. The relative Coefficient of Variability (RCV) for the positive control replicate was 4.06% for percent cysteine depletion against the guideline limit of <14.9 % and 4.19% for percent lysine depletion against the guideline limit of <11.6 %.

Key result

Run / experiment:

other: % Mean Depletion (Cysteine and Lysine)

Parameter:

other: DPRA Prediction

Value:

4

Positive controls validity:

valid

Remarks on result:

no indication of skin sensitisation

Remarks:

DPRA Prediction: Minimal Reactivity (Negative)

Other effects / acceptance of results:

- Acceptance criteria met for positive control:: yes

Reference Controls

The relative coefficient of variability (RCV) of peptide peak areas for the Reference Control C in acetonitrile was 0.52% for Cysteine peptide and 0.61% for Lysine peptide.

 

Mean Reference Control Concentrations:

Peptide	Mean Reference Control A (mM)	Mean Reference Control B (mM)	Mean Reference Control C (mM)	Expected Concentration (mM)
Cysteine	0.51	0.50	0.48	0.45-0.55
Lysine	0.50	0.50	0.50	0.45-0.55

Cysteine Peptide Stability in Acetonitrile

The stability ofCysteine peptide in acetonitrile was checked at 0, 24, and 48 h. The relative coefficient of variability (RCV) for the stability of Cysteine peptide in acetonitrile was 2.03% against set standard of <15%. This showed that Cysteine peptide was stable in acetonitrile.

Data of Precipitation for Cysteine and Lysine Peptide:

Test Item Name	Precipitation/Phase Separation (Yes/No)
	Cysteine	Lysine
2-Amino-5-chloro-N,3-dimethylbenzamide-Replicate 1	No	No
2-Amino-5-chloro-N,3-dimethylbenzamide -Replicate 2	No	No
2-Amino-5-chloro-N,3-dimethylbenzamide -Replicate 3	No	No
2-Amino-5-chloro-N,3-dimethylbenzamide- Co-elution control	No	No

Standard Curve

A standard calibration curve was generated on each day of HPLC analysis and the value of r2 obtained was 0.99996 for Cysteine and 0.99999 for Lysine containing peptides (TABLE 1). This showed that system was suitable for assay. The standard curves are provided in FIGURE 1.

 

Percent Peptide Depletion

 

% Mean Depletion of Peptides with Test Item:

Test Item Name	Actual % Depletion (Cysteine)	Actual % Depletion (Lysine)	% Mean Depletion (Cysteine and Lysine)	Maximum Standard Deviation (Cysteine)	Maximum Standard Deviation(Lysine)	DPRA Prediction
2-Amino-5-chloro-N,3-dimethylbenzamide	8	0	4	0.55	0.54	Minimal Reactivity (Negative)

Interpretation of results:

GHS criteria not met

Conclusions:

From the results of this study, under the specified experimental conditions, 2-Amino-5-chloro-N,3- dimethylbenzamide was identified as negative in the DPRA assay.

Executive summary:

This study was conducted to evaluate the skin sensitisation potential of 2-Amino-5-chloro-N,3-dimethylbenzamide, using synthetic heptapeptides. The method followed was as per OECD Test Guideline No. 442C.

2-Amino-5-chloro-N,3-dimethylbenzamide was found to be soluble in 1:9 mixture of dimethyl sulfoxide: acetonitrile at 100 mM after 1 minute of sonication. Therefore, 1:9 mixture of dimethyl sulfoxide: acetonitrile was selected as vehicle for this study.

Synthetic heptapeptides containing either Lysine (Ac-RFAAKAA-COOH) or Cysteine (Ac-RFAACAA-COOH), were used as the test system in this assay. Cysteine and Lysine containing peptides were incubated with a positive control and the test item for 24 ± 2 hours at 22.5-30 ºC (in the dark), separately. Relative peptide concentration was measured using the high-performance liquid chromatography (HPLC) with gradient elution and UV detection at 220 nm. Cysteine and Lysine peptide percent depletion values were calculated and used in a prediction model which allows assigning the test item to one of four reactivity classes used to support the discrimination between sensitisers and non-sensitisers (OECD, 2015).

HPLC system suitability was determined by the standard calibration curve and the value of r2 obtained was 0.99996 for cysteine and 0.99999 for lysine peptides, against set standard of r2 > 0.99 as per the guideline.

 

The mean peptide concentration of Reference Control A, B and C were mentioned below:

Peptide	Mean Reference Control A (mM)	Mean Reference Control B (mM)	Mean Reference Control C (mM)	Expected Concentration (mM)
Cysteine	0.51	0.50	0.48	0.45-0.55
Lysine	0.50	0.50	0.50	0.45-0.55

The Relative Coefficient of Variability (RCV) for the Reference Control C was 0.52 for cysteine peptide and 0.61 for lysine peptide.

 

The percent peptide depletion obtained for Cysteine and Lysine is as tabulated below:

Sample Name and Date	Percent Peptide Depletion (Cysteine)				Percent Peptide Depletion (Lysine)
	% Depletion	SD	RCV	Expected Depletion	% Depletion	SD	RCV	Expected Depletion
Cinnamaldehyde (Positive control)	86	9020.40	4.06	60.8-100	68	21312.39	4.19	40.2-69
2-Amino-5-chloro-N,3-dimethylbenzamide	8	8182.54	0.55	-	0	8404.74	0.54	-

Percentage peptide depletion value of 2-Amino-5-chloro-N,3-dimethylbenzamide for Cysteine and Lysine were 8% and 0%, respectively. The mean percent depletion for 2-Amino-5-chloro-N,3-dimethylbenzamide was 4%.

The relative coefficient of variability (RCV) for the stability of cysteine peptide in acetonitrile was 2.03% against the set standard of <15% as per the guideline, indicating that cysteine is stable in acetonitrile. In the case of Lysine peptide, the area obtained in the Co-elution chromatograph was 12772, i.e., only 0.81% of the mean peptide peak area of Reference Control C, which was <10%. Hence it was not considered as Co-elution interference (EURL ECVAM, 2013).

From results of this study, under specified experimental conditions, 2-Amino-5-chloro-N,3- dimethylenzamide is predicted as negative.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not sensitising)

Respiratory sensitisation

Endpoint conclusion

Endpoint conclusion:

no study available

Justification for classification or non-classification

Based o two in vitro skin sensitisation tests according to OECD 442C and OECD 442D 2 -Amino-5 -Chloro-N,3 -Dimethylbenzamide is determined to be a non-sensitizing substance to skin.