(3S,11bR)-3-(2-methylpropyl)-9,10-bis[(trideuteriomethyl)oxy]-2,3,4,6,7,11b-hexahydro-1H-pyrido[2,1-a]isoquinolin-2-one compound with (3R,11bS)-3-(2-methylpropyl)-9,10-bis[(trideuteriomethyl)oxy]-2,3,4,6,7,11b-hexahydro-1H-pyrido[2,1-a]isoquinolin-2-one(1:1)