(1R,3aS,8aS)-1-hydroxy-1-methylhexahydroazulene-4,8(1H,5H)-dione

(3bR,6aR)-4-methylenehexahydrocyclobuta[1,2:3,4]di[5]annulene-3a,6b(1H,3bH)-diol

7-methylene-8-methyl-1,8-nonadien-3-one

2-oxo-7-methylbicyclo(4.3.1)dec-6-ene

(1R,3aS,6bS)-1-methylhexahydrocyclobuta[1,2:3,4]di[5]annulene-1,3b,6a(1H,4H)-triol