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4-[(2,4-Diaminophenyl)azo]-2-[4-(phenylsulfonyl)phenyl]-7-(phenylazo)-1-amino-8-hydroxy-3,6-naphthalenedisulfonic acid disodium salt Structure

4-[(2,4-Diaminophenyl)azo]-2-[4-(phenylsulfonyl)phenyl]-7-(phenylazo)-1-amino-8-hydroxy-3,6-naphthalenedisulfonic acid disodium salt