(3S,3aS,6aR)-2-Benzyl-3-((4S,5S)-2,2,5-trimethyl-[1,3]dioxolan-4-yl)-tetrahydro-[1,3]dioxolo[4,5-d]isoxazol-5-one

(3S,4R,5R)-5-((1'S)-1'-acetoxy-ethyl)-3,4-diacetoxy-dihydro-furan-2(3H)-one

3-((4S,5S)-2,2,5-Trimethyl-[1,3]dioxolan-4-yl)-pentanedioic acid diethyl ester

[(2S,3S)-2-((S)-1-Benzyloxy-ethyl)-5-oxo-tetrahydro-furan-3-yl]-acetic acid

[(2S,3R)-2-((S)-1-Benzyloxy-ethyl)-5-hydroxy-tetrahydro-furan-3-yl]-acetic acid