(R)-5-(2-Benzenesulphonylethenyl)-3-(N-methylpyrrolidin-2-ylmethyl)-1H-indole is the free base of (R)-5-(2-Benzenesulphonylethenyl)-3-(N-methylpyrrolidin-2-ylmethyl)-1H-indole Hydrobromide (B120725), which is an impurity of Eletriptan (E505000). Eletriptan is a selective serotonin 5-HT1B and 5-HT1D receptor agonist and used to treat migraines (1,2,3). (R)-5-(2-Benzenesulphonylethenyl)-3-(N-methylpyrrolidin-2-ylmethyl)-1H-indole is also an intermediate in the synthesis of 3-[[(2R)-1-Methyl-2-pyrrolidinyl]methyl]-1-[1-[3-[[(2R)-1-methyl-2-pyrrolidinyl]methyl]-1H-indol-5-yl]-2-(phenylsulfonyl)ethyl]-5-[(1E)-2-(phenylsulfonyl)ethenyl]-1H-indole (M320195). Molecular Formula: C22H24N2O2S Solubility: Dichloromethane, Dimethylformamide, Methanol Molecular Weight: 380.5