Esomeprazole EP Impurity B

Chemical Name: Esomeprazole EP Impurity B ; Omeprazole EP Impurity B ; 4-Desmethoxy Omeprazole ; 5-Methoxy-2-[[(3,5-dimethylpyridin-2-yl)methyl]sulfinyl]-1H-benzimidazole ; 2-[(RS)-[(3,5-dimethylpyridin-2-yl)methyl]sulphinyl]-5-methoxy-1H-benzimidazole ;