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(3Z)-5-amino-6-[(E)-{4-[2-(2,6-dihydroxy-4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]phenyl}diazenyl]-3-(2-{4-[2-(2,6-dihydroxy-4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]phenyl}hydrazinylidene)-4- related products: