((3R,4S,7R)-4-Cyclohexylmethyl-3-hydroxy-2,6-dioxo-1-oxa-9-thia-5-aza-cyclotridec-7-yl)-carbamic acid benzyl ester

(4S,5R)-3-tert-Butoxycarbonyl-4-cyclohexyl-methyl-2,2-dimethyloxazolidine-5-carboxylic acid

(4S,5R)-4-Cyclohexylmethyl-2,2-dimethyl-oxazolidine-3,5-dicarboxylic acid 3-tert-butyl ester 5-(4-iodo-butyl) ester

(4S,5R)-4-Cyclohexylmethyl-2,2-dimethyl-oxazolidine-3,5-dicarboxylic acid 5-[4-((R)-2-amino-2-carboxy-ethylsulfanyl)-butyl] ester 3-tert-butyl ester

(4S,5R)-4-Cyclohexylmethyl-2,2-dimethyl-oxazolidine-3,5-dicarboxylic acid 5-[4-((R)-2-benzyloxycarbonylamino-2-carboxy-ethylsulfanyl)-butyl] ester 3-tert-butyl ester