Methyl lambertianate

15,16-Epoxylabda-8(17),13(16),14-trien-19-oic acid methyl ester

(1S,8aα)-5β-[2-(3-Furanyl)ethyl]decahydro-1,4aβ-dimethyl-6-methylene-1β-naphthalenecarboxylic acid methyl ester