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Administrative data

Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
02 December - 22 December, 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study has been performed according to OECD and/or EC guidelines and according to GLP principles.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2011
Report date:
2011

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)
Deviations:
yes
Remarks:
Deviations from the minimum level of relative humidity occurred. Evaluation: Laboratory historical data do not indicate an effect of the deviations. The study integrity was not adversely affected by the deviation.
Qualifier:
according to guideline
Guideline:
EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)
Deviations:
yes
Remarks:
Deviations from the minimum level of relative humidity occurred. Evaluation: Laboratory historical data do not indicate an effect of the deviations. The study integrity was not adversely affected by the deviation.
Qualifier:
according to guideline
Guideline:
EPA OPPTS 870.1100 (Acute Oral Toxicity)
Deviations:
yes
Remarks:
Deviations from the minimum level of relative humidity occurred. Evaluation: Laboratory historical data do not indicate an effect of the deviations. The study integrity was not adversely affected by the deviation.
Qualifier:
according to guideline
Guideline:
other: Japanese Ministry of Agriculture, Forestry and Fisheries (JMAFF), 12 Nousan, Notification No 8147, November 2000, including the most recent partial revisions.
Deviations:
yes
Remarks:
Deviations from the minimum level of relative humidity occurred. Evaluation: Laboratory historical data do not indicate an effect of the deviations. The study integrity was not adversely affected by the deviation.
GLP compliance:
yes (incl. QA statement)
Test type:
acute toxic class method
Limit test:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
14,14',15,15'-tetradehydro-7,7'-spirobi[dibenzo[b,g][1,9,4,6]dioxadiazacyclododecine]
EC Number:
700-609-8
Cas Number:
1231148-36-9
Molecular formula:
C31H24N4O4
IUPAC Name:
14,14',15,15'-tetradehydro-7,7'-spirobi[dibenzo[b,g][1,9,4,6]dioxadiazacyclododecine]
Details on test material:
- Name of test material (as cited in study report): SX-1
- Physical state: Pale yellow powder
- Storage condition of test material: At room temperature in the dark
- Stability under storage conditions: Stable
- pH (1% in water, indicative range): 8.4 – 8.5 (determined at NOTOX)
- Stability in propylene glycol: Unknown
- Solubility in propylene glycol: Not indicated

Test animals

Species:
rat
Strain:
other: Crl:WI (Han)
Sex:
female
Details on test animals or test system and environmental conditions:
- Source: Charles River Deutschland, Sulzfeld, Germany.
- Age at study initiation: Young adult animals (approx. 9 weeks old)
- Weight at study initiation: Body weight variation was within +/- 20% of the sex mean.
- Fasting period before study: Animals were deprived of food overnight prior to dosing and until 3-4 hours after administration of the test substance. Water was available ad libitum.
- Housing: Group housing of 3 animals per cage in labeled Macrolon cages (MIV type; height 18 cm.) containing sterilized sawdust as bedding material (Litalabo, S.P.P.S., Argenteuil, France) and paper as cage-enrichment (Enviro-dri, Wm. Lillico & Son (Wonham Mill Ltd), Surrey, United Kingdom).
- Diet (e.g. ad libitum): Free access to pelleted rodent diet (SM R/M-Z from SSNIFF® Spezialdiäten GmbH, Soest, Germany).
- Water (e.g. ad libitum): Free access to tap water.
- Acclimation period: The acclimatization period was at least 5 days before the start of treatment under laboratory conditions.
- Health inspection: A health inspection was performed prior to treatment, to ensure that the animals were in a good state of health.

Results of analysis for diet (nutrients and contaminants), sawdust, paper and water were assessed and did not reveal any findings that were considered to have affected the study integrity. All certificates and results of analysis are retained in the NOTOX archives.

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19.9 – 23.6
- Humidity (%): 32 - 56
Deviations from the minimum level of relative humidity occurred. Evaluation: Laboratory historical data do not indicate an effect of the deviations.
The study integrity was not adversely affected by the deviation.
- Air changes (per hr): approximately 15 air changes per hour
- Photoperiod (hrs dark / hrs light): 12/12

IN-LIFE DATES: 02 December 2010 and 08 December 2010

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
propylene glycol
Details on oral exposure:

GAVAGE METHOD: plastic feeding tubes.

VEHICLE
- Justification for choice of vehicle: The vehicle was selected based on trial formulations performed at NOTOX and on test substance data supplied by the sponsor.

MAXIMUM DOSE VOLUME APPLIED: 2000 mg/kg (10 mL/kg) body weight.

DOSAGE PREPARATION: The formulations (w/w) were prepared within 4 hours prior to dosing. Homogeneity was accomplished to a visually acceptable level. Adjustment was made for specific gravity of the vehicle.

Doses:
2000 mg/kg body weight
No. of animals per sex per dose:
6 (2 groups of three females in a stepwise manner)
Control animals:
no
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of observations and weighing:
Mortality/Viability: Twice daily
Body weights: Days 1 (pre-administration), 8 and 15
Clinical signs: At periodic intervals on the day of dosing (Day 1) and once daily thereafter, until Day 15. The symptoms were graded according to fixed scales and the time of onset, degree and duration were recorded.
- Necropsy of survivors performed: At the end of the observation period, all animals were sacrificed by oxygen/carbon dioxide procedure and subjected to necropsy. Descriptions of all internal macroscopic abnormalities were recorded.
- Other examinations performed: none.
Statistics:
No statistical analysis was performed (The method used is not intended to allow the calculation of a precise LD50 value).

Results and discussion

Effect levels
Sex:
female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
Mortality:
No mortality occurred.
Clinical signs:
Hunched posture was noted in three females on Day 1, which disappeared within 2 hours after treatment.
Body weight:
The body weight gain shown by the animals over the study period was considered to be similar to that expected of normal untreated animals of the same age and strain.
Gross pathology:
No abnormalities were found at macroscopic post mortem examination of the animals.

Applicant's summary and conclusion

Interpretation of results:
not classified
Remarks:
Migrated information Criteria used for interpretation of results: EU
Conclusions:
The oral LD50 value of SX-1 in Wistar rats was established to exceed 2000 mg/kg body weight.

According to the OECD 423 test guideline, the LD50 cut-off value was considered to exceed 5000 mg/kg body weight.

Based on these results, SX-1 does not have to be classified and has no obligatory labelling requirement for acute oral toxicity according to the:
- Globally Harmonized System of Classification and Labelling of Chemicals (GHS) of the United Nations (2007),
- Regulation (EC) No 1272/2008 on classification, labelling and packaging of substances and mixtures.
Executive summary:

SX-1 was administered by oral gavage to two subsequent groups of three female Wistar rats at 2000 mg/kg body weight. The study was conducted according to OECD 423 and GLP guidelines.

No mortality occurred.

Hunched posture was noted in three females on Day 1, which disappeared within 2 hours after treatment.

The body weight gain shown by the animals over the study period was considered to be similar to that expected of normal untreated animals of the same age and strain.

No abnormalities were found at macroscopic post mortem examination of the animals.

The oral LD50 value of SX-1 in Wistar rats was established to exceed 2000 mg/kg body weight.