potassium 2-[[4-[[3-methyl-4-[(phenylsulphonyl)oxy]phenyl]azo]phenyl]amino]-5-nitrobenzenesulphonate;Benzenesulfonic acid, 2-4-3-methyl-4-(phenylsulfonyl)oxyphenylazophenylamino-5-nitro-, monopotassium salt;2-[[4-[[3-Methyl-4-[(phenylsulfonyl)oxy]phenyl]azo]phenyl] amino]-5-nitrobenzenesulfonic acid, potassium salt;2-[[4-[[3-Methyl-4-[(phenylsulfonyl)oxy]phenyl]azo]phenyl] amino]-5-nitrobenzenesulfonic acid,potassium salt;2-[[4-[[3-Methyl-4-[(phenylsulfonyl)oxy]phenyl]azo]phenyl]amino]-5-nitro-benzenesulfonic acid, monopotassium salt
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