(2S,4S)-2-[(2-mesyloxyethyl)carbamoyl]-4-tritylthio-1-(allyloxycarbonyl)pyrrolidine

allyl (4R,5S,6S)-3-(((3S,5S)-1-((allyloxy)carbonyl)-5-(2-(ethylsulfonamido)-1-(methoxyimino)ethyl)pyrrolidin-3-yl)thio)-6-((R)-1-hydroxyethyl)-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate

allyl (4R,5S,6S)-3-(((3S,5S)-1-((allyloxy)carbonyl)-5-(1-(methoxyimino)-2-((N-propylsulfamoyl)amino)ethyl)pyrrolidin-3-yl)thio)-6-((R)-1-hydroxyethyl)-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate

allyl (2S,4S)-2-((2-((N,N-dimethylsulfamoyl)amino)ethyl)carbamoyl)-4-(tritylthio)pyrrolidine-1-carboxylate

(2S,4S)-2-{[2-(allyloxycarbonylamino)ethyl]carbamoyl}-4-tritylthio-1-(allyloxycarbonyl)pyrrolidine