(2R,2'R,4'aR,5R,8'aR)-decahydro-2'-hydroxy-2',5,5',5',8'a-pentamethylspiro(furan-2(3H),1'(2'H)-naphthalene)-5-acetaldehyde

(+)-grindelic acid

methyl (2S,4'aR,5R,8'aR)-4,4'a,5,5',6',7',8',8'a-octahydro-2',5,5',5',8'a-pentamethylspiro-5-acetate

(1R,3aR,7aR)-4,4,7a-Trimethyl-1-((R)-5-methyl-5-vinyl-4,5-dihydro-furan-2-yl)-octahydro-inden-1-ol

methyl (2R,2'R,4'aR,5R,8'aR)-decahydro-2'-hydroxy-2',5,5',5',8'a-pentamethylspiro-5-acetate