(2S,4S)-2-[2-(aminocarbonylamino)-2-(hydroxyimino)ethyl]-4-tritylthio-1-(allyloxycarbonyl)pyrrolidine

(2R,4S)-2-{2-[(Z)-Hydroxyimino]-2-[(4-hydroxy-piperidine-1-carbonyl)-amino]-ethyl}-4-tritylsulfanyl-pyrrolidine-1-carboxylic acid allyl ester