174740-62-6 AIDS-033495 AIDS033495 Betulinic acid NH-HepNHCOEtCOOH deriv. Butanoic acid, 4-[[7-[[(3.beta.)-3-hydroxy-28-oxolup-20(29)-en-28-yl]amino]heptyl]amino]-4-oxo- N'-[N-3.beta.-Hydroxylup-20(29)-en-28-oyl]-7-aminoheptyl]carbamoyl]propanoic acid