2,5- dihydroxy benzoic acid;|2,5-dihydroxybenzoc cid;|2,5-Dihydroxybenzoic acid|2,5-dihydroxybenzoic acid.;|2,5-dihydroxybenzoic acid.; Mesalamine Ep Impurity G|5-Hydroxysalicylic Acid;|Carboxyhydroquinone;|Gensigen; Gensigon; Gentisinic Acid;|Gentisc cid;|Hydroquinonecarboxylic Acid;|NSC 27224; NSC 49098; NSC 78825;