Synonyms: Omeprazole Imp. A (EP),Esomeprazole Magnesium Trihydrate Imp. A (EP), Esomeprazole Imp. A (EP), Omeprazole USP Related Compound B, Omeprazole USP RC B, 5-Methoxy-1H-benzimidazole-2-thiol, Omeprazole Related Compound B, Esomeprazole Magnesium Trihydrate Impurity A, Esomeprazole Sodium Impurity A, Omeprazole Impurity A, Esomeprazole Impurity A, Esomeprazole Impurity A