Synonyms: Salicylic Acid Imp. B (EP), 4-Hydroxyisophthalic Acid, 1,3-Benzenedicarboxylic acid, 4-hydroxy-, Isophthalic acid, 4-hydroxy- (6CI,7CI,8CI), 4-Hydroxy-1,3-benzenedicarboxylic acid, 4-Hydroxy-m-phthalic acid, Eupirina, NSC 2445,4-Hydroxybenzene-1,3-dicarboxylic Acid, Acetylsalicylic Acid Imp. B (EP)