(-)-Labd-8(20),13-dien-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 [5β,9α,10α,13E,(-)]-Labda-8(17),13-diene-15-oic acid Copalic acid 5-(2-methylene-5,5,8a-trimethyl-(1R,4aR,8aR)-decahydronaphthalen-1-yl)-3-methylpent-2E-enoic acid 2-Pentenoic acid, 5-[(1R,4aR,8aR)-decahydro-5,5,8a-trimethyl-2-methylene-1-naphthalenyl]-3-methyl-, (2E)-