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IUPAC name:
pentasodium (2E)-7,7'-dihydroxy-6,6'-bis[(1E)-2-(2-hydroxy-3,5-dinitrophenyl)diazen-1-yl]-5,8'-bis[(1E)-2-(4-nitrophenyl)diazen-1-yl]-10,10',12,12'-tetraoxa-2,2',3,3'-tetraaza-11-ferra-11,11'-spirobi[tetracyclo[11.7.1.0⁴,⁹.0¹⁷,²¹]henicosane]-1(20),1'(20'),2,4,4',6,6',8,8',13,13'(21'),14',15,16',17(21),18,18'-heptadecaen-11-uide-15,15',19,19'-tetrasulfonate

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Names:
Reaction products of diazotised 4-amino-5-hydroxy-2,7-naphthalenedisulfonic acid coupled with resorcinol, subsequently coupled with diazotized 2-amino-4,6-dinitrophenol and diazotized 4-nitrobenzenamine, chelated with iron (3+), sodium potassium salts

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