(3R,11bR)-10-hydroxy-3-isobutyl-9-(methoxy-d3)-1,3,4,6,7,11b-hexahydro-2H-pyrido[2,1-a]isoquinolin-2-one compound with (3R,11bR)-9-hydroxy-3-isobutyl-10-(methoxy-d3)-1,3,4,6,7,11b-hexahydro-2H-pyrido[2,1-a]isoquinolin-2-one (1:1),Tetrabenazine Stable Isotopes