(2R,2'R,4'aR,5R,8'aR)-decahydro-2',5,5',5',8'a-pentamethyl-5-vinylspiro-2'-ol

(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-ethanol