epi-Dihydrophaseic acid

(2Z,4E)-3-Methyl-5-[(1R,8S)-1β,5β-dimethyl-3β,8-dihydroxy-6-oxabicyclo[3.2.1]octane-8-yl]-2,4-pentadienoic acid

(2Z,4E)-5-[[(1S)-1α,4α-Dihydroxy-2α,6α-(epoxymethano)-2,6-dimethylcyclohexan-1-yl]]-3-methyl-2,4-pentadienoic acid