Morpholine,4-benzoyl-2-(3,4-difluorophenyl)-2-[2-[4-[[(dimethylamino)carbonyl]amino]-4-phenyl-1-piperidinyl]ethyl]-,(2R)- (9CI); Morpholine,4-benzoyl-2-(3,4-difluorophenyl)-2-[2-[4-[[(dimethylamino)carbonyl]amino]-4-phenyl-1-piperidinyl]ethyl]-,(R)-; SR 144190