(4aR,5R,7S,8aR)-5-(tert-Butyl-diphenyl-silanyloxy)-7-hydroxy-7-[2-methyl-2-((2S,3S,4R,5R,6S)-3,4,5-tris-benzyloxy-6-methyl-tetrahydro-pyran-2-yloxy)-propoxymethyl]-hexahydro-benzo[1,4]dioxin-2-one

8,9-dihydroxy-1-oxa-spiro[4.5]dec-6-en-2-one

3-hydroxy-Δ6,7-8,9-O-isopropylidene-1-oxa-spiro[4.5]decan-2-one

(1R,2S,4R,5R,6R)-4,5-dihydroxydihydro-5'H-7-oxaspiro[bicyclo[4.1.0]heptane-2,2'-furan]-5'-one

7-methanesulfonyloxy-8,9-O-isopropylidene-1-oxaspiro[4.5]decan-2-one