(4S,1'S)-4-ethenyl-1-(1'-phenyleth-1'-yl)pyrrolidin-2-one

(4R,1'S)-2-<2-oxo-1-(1'-phenyleth-1'-yl)pyrrolidin-4-yl>ethanol

(3R,4R,1'S)-4-ethenyl-3-methoxycarbonyl-1-(1'-phenylet-1'-yl)pyrrolidin-2-one