2-Naphthalenesulfonic acid, 6-[[4-amino-6(or 7)-sulfo-1-naphthalenyl]azo]-3-[[4-[(2,4-diaminophenyl)azo]phenyl]azo]-4-hydroxy-, disodium salt

N-(4-aminophenyl)acetamide diazo, first and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid? coupling, product to diazo, and 5-Aminonaphthalene-2-sulfonic acid and 8-Aminonaphthalene-2-sulfonic acid hydrolysis product, acylation coupled amino, again diazotization and Benzene-1,3-diamine coupling.

black.