Copalic acid

(-)-Labd-8(20),13-dien-15-oic acid

[5β,9α,10α,13E,(-)]-Labda-8(17),13-diene-15-oic acid

(2E)-3-Methyl-5-[(1R,4aβ)-2-methylene-5,5,8aα-trimethyldecalin-1α-yl]-2-pentenoic acid

(E)-5-[(1R,4aβ)-Decahydro-5,5,8aα-trimethyl-2-methylenenaphthalen-1-yl]-3-methyl-2-pentenoic acid

(E)-5-[(1R,4aβ)-Decahydro-5,5,8aα-trimethyl-2-methylenenaphthalene-1-yl]-3-methyl-2-pentenoic acid