4-Desmethoxy-4-chloro Omeprazole; Esomeprazole Impurity H

4-Desmethoxy-4-chloro Omeprazole; Esomeprazole Impurity H

2-{[(4-chloro-3,5-dimethylpyridin-2-yl)methyl]sulfinyl}-5-methoxy-1H-benzimidazole

Impurity reference standard used for related substances testing of Esomeprazole ;Omeprazole S-Isomer drug substance and drug product per pharmacopoeial limits.