(2S,4S)-2-{[(5,6-Dihydro-4H-pyrimidin-1-yl)-imino-methyl]-carbamoyl}-4-tritylsulfanyl-pyrrolidine-1-carboxylic acid allyl ester

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

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

(2S,4S)-2-[(1-hydroxy-2-ethoxycarbonyl)ethyl]-4-tritylthio-1-(allyloxycarbonyl)pyrrolidine

(2S,4S)-2-(1-Hydroxy-2-nitro-ethyl)-4-tritylsulfanyl-pyrrolidine-1-carboxylic acid allyl ester