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Sumatriptan EP Impurity A Catalogue No. - VL950007 CAS No. - 545338-89-4 Molecular Formula - C₂₇H₃₇N₅O₂S Molecular Weight - 495.68 IUPAC Name - 3-[2-(Dimethylamino)ethyl]-2-[[3-[2-(dimethylamino)ethyl]-1H-indol-5-yl]methyl]-N-methyl-1H-Indole-5-methanesulfonamide Synonyms - Sumatriptan BP Impurity A / Sumatriptan Related Compound A