Omeprazole EP Impurity - H

4-Desmethoxy-4-chloro Omeprazole; 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; 2-[(RS)-[(4-Chloro-3,5-dimethylpyridin-2- yl)methyl]sulfinyl]-5-methoxy-1H-benzimidazole