(2S,4S)-2-[(2-Hydroxy-ethanesulfonylamino)-methyl]-4-tritylsulfanyl-pyrrolidine-1-carboxylic acid 4-methoxy-benzyl ester

(2S,4S)-2-(1,1-dioxo-2-p-methoxybenzyloxycarbonyl-3,4,5,6-tetrahydro-1,2,6-thiadiazin-6-yl)methyl-4-mercapto-1-p-methoxybenzyloxycarbonylpyrrolidine

(4R,5S,6S)-3-[(3S,5S)-5-(2,4-Dioxo-imidazolidin-1-ylmethyl)-1-(4-methoxy-benzyloxycarbonyl)-pyrrolidin-3-ylsulfanyl]-6-((R)-1-hydroxy-ethyl)-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-methoxy-benzyl ester

(2S,4S)-1-p-methoxybenzyloxycarbonyl-4tritylthio-2-(p-methoxybenzyloxycarbonylaminosulfonylaminomethyl)pyrrolidine

(2S,4S)-2-(Acetylamino-methyl)-4-tritylsulfanyl-pyrrolidine-1-carboxylic acid 4-methoxy-benzyl ester