5-((3a-(((4-Carboxy-3,3-dimethylbutanoyl)oxy)methyl)-1-isopropyl-5a,5b,8,8,11a-pentamethylicosahydro-1H-cyclopenta[a]chrysen-9-yl)oxy)-3,3-dimethyl-5-oxopentanoic acid AIDS-161612 AIDS161612 NSC705962