3,28-Di-O-acetylbetulin AIDS-080364 AIDS080364 Acetic acid (1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-9-acetoxy-1-isopropenyl-5a,5b,8,8,11a-pentamethyl-eicosahydro-cyclopenta[a]chrysen-3a-ylmethyl ester Betulin deriv. Betulin diacetate