(R)-5-((S)-3-Benzenesulfonyl-6-{(6S,7R)-7-[2-(tert-butyl-dimethyl-silanyloxy)-ethyl]-6,7-dimethyl-1,4-dioxa-spiro[4.5]dec-6-yl}-4-hydroxy-2-methyl-hexyl)-2,2-dimethyl-oxazolidine-3-carboxylic acid benzyl ester

(R)-5-((S)-3-Benzenesulfonyl-2-methyl-propyl)-2,2-dimethyl-oxazolidine-3-carboxylic acid benzyl ester

((2R,4S)-2,5-Dihydroxy-4-methyl-pentyl)-carbamic acid benzyl ester

((2R,4S)-2-Hydroxy-4-methyl-5-phenylsulfanyl-pentyl)-carbamic acid benzyl ester

(R)-5-[(S)-6-((6S,7R)-7-Carboxymethyl-6,7-dimethyl-1,4-dioxa-spiro[4.5]dec-6-yl)-2-methyl-4-oxo-hexyl]-2,2-dimethyl-oxazolidine-3-carboxylic acid benzyl ester