(3aR,5S,7R,7aR)-7-(tert-Butyl-diphenyl-silanyloxy)-5-(2-hydroxy-2-methyl-propoxymethyl)-2,2-dimethyl-hexahydro-benzo[1,3]dioxol-5-ol

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

Δ6,7-8,9-O-isopropylidene-1-oxa-spiro[4.5]decan-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