3-16-00-01135 (Beilstein Handbook Reference) 4-Amino-2-hydroxybenzenearsonic acid 6318-57-6 Arsonic acid, (4-amino-2-hydroxyphenyl)- (9CI) BRN 3270180 Benzenearsonic acid, 4-amino-2-hydroxy- NSC 31664 p-ARSANILIC ACID, 2-HYDROXY-