(2S,3S,11bS)-3-isobutyl-9,10-bis(methoxy-d3)-1,3,4,6,7,11b-hexahydro-2H-pyrido[2,1-a]isoquinolin-2-ol,(2S,3S,11bS)-3-isobutyl-9,10-bis(methoxy-d3)-1,3,4,6,7,11b-hexahydro-2H-pyrido[2,1-a]isoquinolin-2-ol,"Labeled Tetrabenazine, intended for use as an internal standard for the quantification of Tetrabenazine by GC- or LC-mass spectrometry.",Tetrabenazine Stable Isotopes