(3R,S)-N'-[N-[3.beta.-Hydroxylup-20(29)-en-28-oyl]-3-amino-3-phenylpropionic acid 174740-50-2 AIDS-033507 AIDS033507 Benzenepropanoic acid, .beta.-[[8-[[(3.beta.)-3-hydroxy-28-oxolup-20(29)-en-28-yl]amino]-1-oxooctyl]amino]-, (S)- Betulinic acid NH-HepCONHEtCOOH deriv.