(1S,R-S)-6,7-dimethoxy-N-methyl-1-(p-tolyl-sulfinylmethyl)-1-trifluoromethyl-1,2,3,4-tetrahydroisoquinoline

The title compound, C21H24F3NO3S, is an intermediate in the synthesis of en antiomerically pure alkaloids; the molecular structure has been determined to establish its stereochemistry. The molecular conformation is largely det ermined by intramolecular interactions, while the packing in the crystal do es not show any unusual features.