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Benzoic acid, 3,3'-methylenebis[6-[[2,4- dihydroxy-5-[(4-sulfonylphenyl)azo]phenyl]azo]-, sodium salt Structure

Benzoic acid, 3,3'-methylenebis[6-[[2,4- dihydroxy-5-[(4-sulfonylphenyl)azo]phenyl]azo]-, sodium salt