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7,7'-(Carbonyldiimino)bis[4-hydroxy-3-[(4-sulfo-1-naphthalenyl)azo]-2-naphthalenesulfonic acid]tetrasodium salt Structure

7,7'-(Carbonyldiimino)bis[4-hydroxy-3-[(4-sulfo-1-naphthalenyl)azo]-2-naphthalenesulfonic acid]tetrasodium salt