(+)-?-Dihydrotetrabenazine; (2R,3R,11bR)-1,3,4,6,7,11b-Hexahydro-9,10-dimethoxy-3-(2-methylpropyl)-2H-benzo[a]quinolizin-2-ol; [2R-(2?,3?,11b?)]-1,3,4,6,7,11b-Hexahydro-9,10-dimethoxy-3-(2-methylpropyl)-2H-benzo[a]quinolizin-2-ol; (+)-(2R,3R,11bR)-Dihydrotetrabenazine; (+)-DTBZ; (+)-Dihydrotetrabenazine; (2R,3R,11bR)-DHTBZ