9,11a-Methano-11aH-cyclohepta[a]naphthalene-8,10(9H,11H)-dione, 1,2,3,4,4a,5,6,11b-octahydro-4,4,6,9,11b-pentamethyl-, (4aS,9R,11aS,11bS)- AIDS-220190 AIDS220190