Sumatriptan EP Impurity C Catalogue No.- VL950005 CAS No. - 1797905-62-4 Molecular Formula - C₁₅H₂₃N₃O₃S Molecular Weight - 325.43 IUPAC Name - [3-[3-(Dimethylamino)ethyl]-1-(hydroxymethyl)-1H-indol-5-yl]-N-methylmethanesulfonamid