(4Z)-3-oxo-4-{[4-({4-[({4-[(2Z)-2-(2-oxo-3,6-disulfonaphthalen-1(2H)-ylidene)hydrazino]phenyl}carbonyl)amino]phenyl}sulfanyl)phenyl]hydrazono}-3,4-dihydronaphthalene-2,7-disulfonic acid
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