Rabeprazole EP Impurity B Catalogue No.- VL970008 CAS No. - 117977-21-6 Molecular Formula - C18H21N3O2S Molecular Weight - 343.44 IUPAC Name - 2-[[4-(3-Methoxypropoxy)-3-methyl-pyridin-2-yl]methylthio]benzoimidazole ; Synonyms - Rabeprazole Related Compound E / Rabeprazole Sulfide