2-[[(4-Chloro-3,5-dimethyl-2-pyridinyl)methyl]sulfinyl]-5-methoxy-1H-benzimidazole ; 5-Methoxy-2-[[(4-Chloro-3,5-dimethyl-pyridine-2-yl)methyl]sulfinyl]-1H-benzimidazole ; Esomeprazole Impurity H ; Omeprazole EP Impurity H ; (S) -4-Desmethoxy-4-chloro Omeprazole