2H,9H,11H-9,20-Epoxy-1,8a-(epoxymethano)-20,10-methenocyclodecacyclotetradecen-23-one, 1,3,4,7,8,12,15,16,19,20a-decahydro-5,14,18-trimethyl-2-(1-methylethyl)-, (1R*,2S*,5E,8aS*,9R*,13E,17E,20S*,20aS*)-