N-methyl-1-[3-[2-(methylamino)ethyl]-1H-indol-5-yl]methanesulfonamide;Sumatriptan Impurity 2(Sumatriptan EP Impurity B);Sumatriptan EP Impurity B Hemisuccinate;N-Methyl-3-[2-(MethylaMino)ethyl]-1H-indole-5-MethanesulfonaMide;SuMatriptan EP IMpurity B;Sumatriptan Succinate EP impurity B;N-DesMethyl SuMatriptan;N-Methyl[3-[2-(methylamino)ethyl]-1H-indol-5-yl] methane sulphon amide