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7,7'-(carbonyldiimino)bis[4-hydroxy-3-[(2-methyl-4-sulphophenyl)azo]naphthalene-2-sulphonic] acid, compound with 2,2'-iminodiethanol (1:4)  Structure

7,7'-(carbonyldiimino)bis[4-hydroxy-3-[(2-methyl-4-sulphophenyl)azo]naphthalene-2-sulphonic] acid, compound with 2,2'-iminodiethanol (1:4)