(1R,3aS,5aR,5bR,7aR,9R,11aR,11bR,13aR,13bR)-9-(3-Carboxy-3-methyl-butanoylamino)-1-isopropenyl-5a,5b,8,8,11a-pentamethyl-eicosahydro-cyclopenta[a]chrysene-3a-carboxylic acid 3.alpha.-(3',3'-Dimethylsuccinyl)-amido-3-deoxy-betulinic acid AIDS-098154 AIDS098154