(1R*,2'R*,4R*,8R*)-8-methyl-3-oxabicyclo<3.3.0>octa-2,7-dione-1-spiro-1'-(2'-hydroxy-4'-methyl-3'-cyclohexene)

rac-(1R,2R,3a'R,6a'R)-5'-bromo-3a',4-dimethyl-2-((trimethylsilyl)oxy)-3a',5',6',6a'-tetrahydro-2'H,4'H-spiro[cyclohexane-1,3'-cyclopenta[b]furan]-3-ene-2',4'-dione

rac-(3R,3aR,5S,6aS,10aR)-3a,8-dimethyl-4-methylene-3,3a,4,5,6a,9-hexahydro-1H,10H-3,5-methanofuro[3,4-d]chromen-1-one