Davanone

(S)-2-[(2S,5R)-Tetrahydro-5-methyl-5-vinylfuran-2-yl]-6-methyl-5-hepten-3-one

(S)-2-[(2S,5R)-5-Methyl-5-ethenyltetrahydrofuran-2-yl]-6-methyl-5-heptene-3-one