kolavenic acid

(E)-3-Methyl-5-[(1S)-1,2,3,4,4a,7,8,8aβ-octahydro-1,2α,4aα,5-tetramethylnaphthalen-1β-yl]-2-pentenoic acid

(2E)-3-Methyl-5-[(1S)-1,2α,4aα,5-tetramethyl-1,2,3,4,4a,7,8,8aβ-octahydronaphthalene-1β-yl]-2-pentenoic acid