2-Amino-p-toluenesulfonic acid 3-14-00-02222 (Beilstein Handbook Reference) 3-Aminotoluene-4-sulphonic acid 88-62-0 BRN 2098666 Benzenesulfonic acid, 2-amino-4-methyl- EINECS 201-844-4 Kyselina 2-toluidin-4-sulfonova [Czech] p-Toluenesulfonic acid, 2-amino-