tert-butyl (E)-4-((1S,6R)-3-(((tert-butyldiphenylsilyl)oxy)methyl)-4-((E)-hept-1-en-1-yl)-5-oxo-7-oxaspiro[bicyclo[4.1.0]heptane-2,2'-[1,3]dioxan]-3-en-6-yl)-2-methylbut-2-enoate

(1R,6S)-4-bromo-3-(((tert-butyldiphenylsilyl)oxy)methyl)-5',5'-diethyl-7-oxaspiro[bicyclo[4.1.0]heptane-2,2'-[1,3]dioxan]-3-en-5-one

(1S,4'R,5R,6S,6'R)-3-(((tert-butyldiphenylsilyl)oxy)methyl)-4',6'-dimethyl-4-((E)-pent-1-en-1-yl)-7-oxaspiro[bicyclo[4.1.0]heptane-2,2'-[1,3]dioxan]-3-en-5-ol

(1S,4'R,6R,6'R)-3-(((tert-butyldiphenylsilyl)oxy)methyl)-4',6'-dimethyl-4-((E)-pent-1-en-1-yl)-7-oxaspiro[bicyclo[4.1.0]heptane-2,2'-[1,3]dioxan]-3-en-5-one

8-bromo-7-[[[(1,1-dimethylethyl)diphenylsilyl]oxy]methyl]-10-(2-propenyl)-1,5-dioxospiro[5,5]undeca-7,10-dien-9-one