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Rabeprazole EP Impurity I Catalogue No. - VL970003 CAS No. - 924663-37-6 Molecular Formula - C18H21N3O5S Molecular Weight - 391.44 IUPAC Name - 2-[[[4-(3-Methoxypropoxy)-3-methyl-1-oxido-2-pyridinyl] methyl]sulfonyl]-1H-benzimidazole Synonyms - Rabeprazole EP Impurity I Rabeprazole Sulphone N Oxide