4-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]-5-methylbenzenesulphonic acid
4-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]-5-methylbenzenesulphonic acid ??
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4-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]-5-methylbenzenesulphonic acid C??? ??, ??, ??
4-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]-5-methylbenzenesulphonic acid ?? ?? ? ???
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4-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]-5-methylbenzenesulphonic acid ?? ??
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