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

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 is Dimerized Eletriptan (E505000) impurity 2. Eletriptan is a selective serotonin (5-HT1) agonist, used for the acute treatment of the headache phase of migraine attacks.