(1R,5R,6S)-6-((S)-1-Benzyloxy-ethyl)-2,7-dioxa-bicyclo[3.2.1]octan-3-one

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

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

(2S,3S)-ethyl 2,3-dihydroxy-3-((4'S,5'S)-2',2',5'-trimethyl-1',3'-dioxolan-4'-yl)propanoate

4-deoxy-L-threose acetonide N-benzylimine