(1R,3aR,4S,5aR,5bR,7aR,11aR,11bR,13aR,13bR)-1-Isopropenyl-3a,5a,5b,8,8,11a-hexamethyl-eicosahydro-cyclopenta[a]chrysen-9-one 1617-70-5 AIDS-082905 AIDS082905 Lup-20(29)-en-3-one Lupenone