Spiro[7,10-methano-9H-benzo[a]cyclopenta[d]cyclooctene-9,3'(2'H)-naphtho[2,3-b]furan]-2'-one,1,2,3,3a,3'a,4,4',4'a,5,6,7,7',8,8',8'a,9',9'a,10,11,11a-eicosahydro-5',6,8'a,10,11a-pentamethyl-3-(1-methylethyl)-,[3R-[3a,3ab,6a,7a,9a(3'aS*,4'aS*,8'aS*,9'aS*),