(Z)-but-2-enedioic acid;2-[5-(pyrrolidin-1-ylsulfonylmethyl)-1H-indol-3-yl]-N,N-bis(trideuteriomethyl)ethanamin,(Z)-but-2-enedioic acid;2-[5-(pyrrolidin-1-ylsulfonylmethyl)-1H-indol-3-yl]-N,N-bis(trideuteriomethyl)ethanamin,"Labeled Almotriptan, intended for use as an internal standard for the quantification of Almotriptan by GC- or LC-mass spectrometry.",Almotriptan Therapeutic