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Sumatriptan EP Impurity D Catalogue No. - VL950006 CAS No. - 212069-94-8 Molecular Formula - C14H21N3O3S Molecular Weight - 311.40 IUPAC Name - N,N-Dimethyl-2-[5-[(methylsulphamoyl)methyl]-1H-indol-3-yl] ethanamine N-oxide Synonyms - Sumatriptan BP Impurity D / Sumatriptan N-Oxide