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2-[2-(4-nitro-2-sulphophenyl)vinyl]-5-[[4-[(4-sulphophenyl)azo]-1-naphthyl]-NNO-azoxy]benzenesulphonic acid  Structure

2-[2-(4-nitro-2-sulphophenyl)vinyl]-5-[[4-[(4-sulphophenyl)azo]-1-naphthyl]-NNO-azoxy]benzenesulphonic acid