trisodium (3E)-5-hydroxy-3-{2-[(7Z)-7-(2-{4'-[(2Z)-2-(8-hydroxy-1-oxo-4-sulfonatonaphthalen-2(1H)-ylidene)hydrazinyl]-3,3'-dimethylbiphenyl-4-yl}hydrazinylidene)-8-oxo-6-sulfonato-7,8-dihydronaphthalen-2-yl]hydrazinylidene}-4-oxo-3,4-dihydronaphthalene-1-sulfonate
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