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Tetrabenazine Related Impurity Tetrabenazine Related Impurity 1 rac-3(Desisobutyl)-5-Isobutyl Tetrabenazine 1,3,4,6,7,11b-Hexahydro-1-isobutyl-9,10-dimethoxy-2H-benzo[a]quinolizin-2-one 1-isobutyl-9,10-dimethoxy-1,3,4,6,7,11b-hexahydro-pyrido[2,1-a]isoquinolin-2-one 9,10-dimethoxy-1-(2-methylpropyl)-1,3,4,6,7,11b-hexahydrobenzo[a]quinolizin-2-one 1-Isobutyl-9,10-dimethoxy-1,3,4,6,7,11b-hexahydro-2H-pyrido[2,1-a]isoquinolin-2-one 1-Isobutyl-9,10-dimethoxy-3,4,6,7-tetrahydro-1H-pyrido[2,1-a]isoquinolin-2(11bH)-one 1,3,4,6,7,11b-Hexahydro-9,10-dimethoxy-1-(2-methylpropyl)-2H-benzo[a]quinolizin-2-one 2H-Benzo[a]quinolizin-2-one, 1,3,4,6,7,11b-hexahydro-9,10-dimethoxy-1-(2-methylpropyl)-