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4-hydroxy-5-[[2-hydroxy-4-[3-hydroxy-4-[[3-(5-hydroxy-3-methyl-1H-pyrazol-1-yl)phenyl]azo]anilino]phenyl]azo]-3-[[4-(4-nitro-2-sulphoanilino)phenyl]azo]naphthalenedisulphonic acid, sodium salt Structure

4-hydroxy-5-[[2-hydroxy-4-[3-hydroxy-4-[[3-(5-hydroxy-3-methyl-1H-pyrazol-1-yl)phenyl]azo]anilino]phenyl]azo]-3-[[4-(4-nitro-2-sulphoanilino)phenyl]azo]naphthalenedisulphonic acid, sodium salt