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(4Z)-4-[2-(4-{(2E)-2-[(7E)-7-(2-{4-[(2E)-2-(3-carboxy-4-oxonaphthalen-1(4H)-ylidene)hydrazinyl]phenyl}hydrazinylidene)-1,8-dioxo-4-sulfo-7,8-dihydronaphthalen-2(1H)-ylidene]hydrazinyl}phenyl)hydraziny related products: