Chemical Name: Â 4-Hydroxybenzoic acid CAS No .: 99-96-7 Synonyms: Â :Para Hydroxy Benzoic Acid (PHBA);p-Hydroxybenzoic acid(PHBA);Acetylsalicylic Acid EP Impurity A;4-hydroxy-benzoicaci;acidop-idrossibenzoico;Benzoic acid, p-hydroxy-;benzoicacid, 4-hydroxy;Benzoicacid, 4-hydroxymore...