1-Amino-2-methyl-5-benzenesulfonic acid 2-Amino-4-toluenesulfonic acid 3-Amino-4-methylbenzenesulfonic acid 3-Amino-p-toluenesulfonic acid 618-03-1 Benzenesulfonic acid, 3-amino-4-methyl- NSC7922 p-Toluenesulfonic acid, 3-amino-