Similar names: m-Toluenesulfonic acid, 6-amino- (6CI,7CI,8CI); 2-Amino-5-methylbenzenesulfonic acid; 1-Amino-4-methylbenzene-2-sulfonic acid; 2-Amino-5-methyl-1-benzenesulfonic acid; 4-Amino-1-methylbenzene-3-sulfonic acid; 4-Aminotoluene-3-sulfonic acid; 4-Methyl-2-sulfoaniline; 4-Methylaniline-2-sulfonic acid; 4B Acid; 6-Amino-m-toluenesulfonic acid; NSC 7544; PTMS; PTMSA; p-Toluidine-2-sulfonic acid; p-Toluidine-m-sulfonic acid