3-[(6S,7R)-7-(2-Hydroxy-ethyl)-6,7-dimethyl-1,4-dioxa-spiro[4.5]dec-6-yl]-propionic acid methyl ester

((2R,4S)-4-Methyl-5-oxo-tetrahydro-furan-2-ylmethyl)-carbamic acid benzyl ester

3-{(6S,7R)-7-[2-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-6,7-dimethyl-1,4-dioxa-spiro[4.5]dec-6-yl}-propionic acid methyl ester

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