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Rabeprazole EP Impurity A Catalogue No. - VL970007 CAS No. - 117976-47-3 Molecular Formula - C18H21N3O4S Molecular Weight - 375.44 IUPAC Name - 2-[[4-(3-Methoxypropoxy)-3-methyl-pyridin-2-yl]methylsulfonyl]benzoimidazole Synonyms - Rabeprazole Related Compound D / Rabeprazole Sulfone