2-Carboxy-4'-(dimethylamino)azobenzene, O-METHYL RED, 2-[[4-(dimethylamino)phenyl]diazenyl]benzoic acid, Benzoic acid, 2-[[4-(dimethylamino)phenyl]azo]-, p-(Dimethylamino)azobenzene-o-carboxylic acid, Hydrazine sulfate, Acid Red 2, Methyl red, 4-Dimethylamino-2'-carboxylazobenzene, C.I. Acid Red 2, 4-Dimethylaminoazobenzene-2'-carboxylic acid, 2-(4-Dimethylaminophenylazo)benzoic acid, Methyl Red,indicator, 4'-dimethylaminoazobenzene-2-carboxylic acid, 2-[4-(dimethylamino)phenylazo]benzoic acid, METHIC RED YB LIQUID, 4-Dimethylaminoazobenzene-2'-carboxylic acid, Methylred (C.I. 13020) indicator