(E)-1-[(1R)-1β,4β-Epoxy-2,6,6-trimethyl-2-cyclohexen-1-yl]-2-buten-1-one;(E)-1-[(1R,4S)-2,6,6-Trimethyl-7-oxabicyclo[2.2.1]hept-2-en-1-yl]-2-buten-1-one
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