(1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-9-(4-Carboxy-3,3-dimethyl-butanoylamino)-1-isopropenyl-5a,5b,8,8,11a-pentamethyl-eicosahydro-cyclopenta[a]chrysene-3a-carboxylic acid 2-oxo-2-phenyl-ethyl ester 3.beta.-(3',3'-Dimethyl)-glutarylamide-3-deoxy-betulinic acid 28-O-phenacyl ester AIDS-098151 AIDS098151