(3R,S)-N'-[N-3.beta.-Hydroxylup-20(29)-en-28-oyl]-8-aminooctanoyl]-3-amino-4,4,4-trifluorobutyric acid 174740-54-6 AIDS-033511 AIDS033511 Betulinic acid NH-HepCONHEtCOOH deriv. Butanoic acid, 4,4,4-trifluoro-3-[[8-[[(3.beta.)-3-hydroxy-28-oxolup-20(29)-en-28-yl]amino]-1-oxooctyl]amino]-