Pantoprazole Impurity 29; Pantoprazole EP Impurity D; N-Methyl Pantoprazole; 5-(difluoromethoxy)-2-[(3,4-dimethoxypyridin-2-yl)methylsulfinyl]-1-methylbenzimidazole; 5-(Difluoromethoxy)-2-[[(3,4-dimethoxy-2-pyridinyl)methyl]sulfinyl]-1-methyl-1H-benzimidazole; Pantoprazole EP Impurity F