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4-Hydroxy-7-[3-(5-hydroxy-7-sodiooxysulfonyl-2-naphtyl)ureido]-3-(m-sodiooxysulfonylphenylazo)-2-naphthalenesulfonic acid sodium salt Structure

4-Hydroxy-7-[3-(5-hydroxy-7-sodiooxysulfonyl-2-naphtyl)ureido]-3-(m-sodiooxysulfonylphenylazo)-2-naphthalenesulfonic acid sodium salt