1,3-Dihydro-5-methoxy-2H-benzimidazole-2-thione;|2-Mercapto-5-methoxy-1H-benzimidazole;|2-Mercapto-5-methoxybenzimidazole;|5-Methoxy-1H-benzimidazole-2-thiol;|5-Methoxy-2-benzimidazolethiol|5-Methoxy-2-mercaptobenzimidazole;|Esomeprazole EP Impurity A;|Omeprazole BP Impurity A ; Omeprazole USP RC B ; Esomeprazole EP Impurity A ; 5-Methoxy-1H-benzimidazole-2-thiol ;