1 B2Q (2s,3r,11br)-3-butyl-9,10-dimethoxy-1,3,4,6,7,11b-hexahydro-2h-pyrido[2,1-a]isoquinolin-2-amine 1.000 2 EBZ (3s,5r,11bs)-9,10-dimethoxy-3-(2-methylpropyl)-1,3,4,6,7,11b-hexahydro-2h-pyrido[2,1-a]isoquinolin-2-one 0.840 3 YHL Tetrabenazine 0.840