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(3E)-3-{[4-({4-[(E)-{2,4-diamino-5-methyl-3-[(E)-(4-sulfonaphthalen-1-yl)diazenyl]phenyl}diazenyl]phenyl}sulfanyl)phenyl]hydrazono}-6-oxocyclohexa-1,4-diene-1-carboxylic acid related products: