(3R,S)-N'-[N-3.beta.-Hydroxylup-20(29)-en-28-oyl]-8-aminooctanoyl]-3-amino-3-fluoropropionic acid 174740-53-5 AIDS-033510 AIDS033510 Betulinic acid NH-HepCONHEtCOOH deriv. Propanoic acid, 3-fluoro-3-[[8-[[(3.beta.)-3-hydroxy-28-oxolup-20(29)-en-28-yl]amino]-1-oxooctyl]amino]-