A 5-membered lactone ring with a methyl group at the 3rd carbon and a ketone group at the 4th carbon.
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tert-Butyl-{(R)-2-[(4S,5S,6S)-6-((E)-(S)-1,4-dimethyl-pent-2-enyl)-2,2,5-trimethyl-[1,3]dioxan-4-yl]-propoxy}-diphenyl-silane
(S)-3,5-dimethyl-2-isopropyl-2-cyclohexen-1-one