(2S,4S)-2-{[(2-Hydroxymethyl-pyrrolidin-1-yl)-imino-methyl]-carbamoyl}-4-tritylsulfanyl-pyrrolidine-1-carboxylic acid allyl ester

(4R,5S,6S)-3-((3S,5S)-1-Allyloxycarbonyl-5-{[(pyrrolidine-1-carbothioyl)-amino]-methyl}-pyrrolidin-3-ylsulfanyl)-6-((R)-1-hydroxy-ethyl)-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid allyl ester

(2S,4S)-2-(2-Piperazin-1-yl-ethylcarbamoyl)-4-tritylsulfanyl-pyrrolidine-1-carboxylic acid allyl ester

3-[(2S,4S)-N-allyloxycarbonyl-4-tritylthiopyrrolidin-2-yl]acrylic acid ethyl ester

(2S,4S)-2-isothiocyanatomethyl-4-tritylthio-1-(allyloxycarbonyl)pyrrolidine