(11bR)-3-Isobutyl-1-10-methoxy-2,3,4,6,7,11b-hexahydro-1H-pyrido[2,1-a]isoquinoline-2,9-diol is a useful synthetic intermediate. It is also a derivative compound of Tetrabenazine (T284000), which functions as a dopamine depleting agent. An antidyskinetic; antipsychotic.