(2S,4S)-2-{[(Thiomorpholine-4-carbonyl)-amino]-methyl}-4-tritylsulfanyl-pyrrolidine-1-carboxylic acid allyl ester

(2R,4S)-2-{2-[(Z)-Hydroxyimino]-2-[(4-hydroxy-piperidine-1-carbonyl)-amino]-ethyl}-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

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

(2S,4S)-4-Mercapto-2-phenylsulfanylmethyl-pyrrolidine-1-carboxylic acid allyl ester