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

(1R,2S,7S,9S,11R)-2-Hydroxymethyl-1,5-dimethyl-12-methylene-8-oxa-tricyclo[7.2.1.02,7]dodec-5-en-11-ol

5,14-Dimethyl-2,10-dioxa-9,13-dioxotetracyclo[6.4.2.03,8.011,14]tetradecan-4-ene