1 1PL (1s,3as,5ar,8as)-1,7,7-trimethyl-1,2,3,3a,5a,6,7,8-octahydrocyclopenta[C]pentalene-4-carboxylic acid 1.000 2 V4R 3,9,9-trimethyl-6,7,8,9-tetrahydro-5h-benzo[7]annulene-2-carboxylic acid 0.700