(2S,3S,4R)-N-tert-butyloxycarbonyl-4-benzoyloxy-3-difluoromethyl-2-(tert-butyldiphenylsiloxymethyl)pyrrolidine

(2S,4R)-N-tert-butyloxycarbonyl-4-benzoyloxy-3-difluoromethylenyl-2-(tert-butyldiphenylsiloxymethyl)pyrrolidine

(S)-tert-butyl 2-(hydroxymethyl)-2,5-dihydro-1H-pyrrole-1-carboxylate

(5S,4S,3R)-N-tert-butyloxycarbonyl-5-tert-butyldimethylsiloxymethyl-4-difluoromethyl-3-(tert-butyldimethylsiloxy)pyrrolidin-2-one