methyl 2-((3a'R,4'S,5a'S,8'R,9a'S,9b'S)-4'-((E)-1-hydroxy-3-(trimethylsilyl)allyl)octahydrospiro[cyclohexane-1,2'-[1,3]dioxolo[4,5-d]pyrano[3,2-b]pyran]-8'-yl)acetate

methyl 2-((3a'R,4'S,5a'S,8'R,9a'S,9b'S)-4'-((S,E)-1-hydroxy-3-(trimethylsilyl)allyl)octahydrospiro[cyclohexane-1,2'-[1,3]dioxolo[4,5-d]pyrano[3,2-b]pyran]-8'-yl)acetate

methyl 2-((3a'S,4'R,5a'S,8'R,9a'S,9b'S)-4'-formyloctahydrospiro[cyclohexane-1,2'-[1,3]dioxolo[4,5-d]pyrano[3,2-b]pyran]-8'-yl)acetate

(3a'R,4'S,6'S,7'R,7a'R)-4'-((S)-1,4-dioxaspiro[4.5]decan-2-yl)tetrahydro-4'H-spiro[cyclohexane-1,2'-[1,3]dioxolo[4,5-c]pyran]-6',7'-diyl diacetate

methyl 2-((3a'R,4'S,5a'S,8'R,9a'S,9b'S)-4'-((S)-1,4-dioxaspiro[4.5]decan-2-yl)octahydrospiro[cyclohexane-1,2'-[1,3]dioxolo[4,5-d]pyrano[3,2-b]pyran]-8'-yl)acetate