(2aR,7aS,7bR)-5-methyl-3,4,6,7,7a,7b-hexahydro-2aH-indeno[1,7-bc]furan-2-one

(E)-3-((3S,3aR,4S)-3-hydroxy-7-methyl-2,3,3a,4,5,6-hexahydro-1H-inden-4-yl)-2-methyl-acrylic acid ethyl ester

(R)-3-(prop-1-en-2-yl)cyclopent-2-enyl acetate

3-(1-Methylethenyl)-2-cyclopentenone