2-Amino-4-sulfophenol 2-Aminophenol-4-sulfonic acid 2-Hydroxy-5-sulfoaniline 3-AMINO-4-HYDROXYBENZENE SULFONIC ACID 3-Amino-4-hydroxybenzenesulfonic acid 4-Hydroxy-3-aminobenzenesulfonic acid 4-Hydroxymetanilic acid 98-37-3 Benzenesulfonic acid, 3-amino-4-hydroxy- Metanilic acid, 4-hydroxy- NSC1491 o-Aminophenol-p-sulfonic acid