150840-73-6 AIDS-033492 AIDS033492 Betulinic acid NH-HepCONHPrCOOH deriv. Butanoic acid, 4-[[8-[[(3.beta.)-3-hydroxy-28-oxolup-20(29)-en-28-yl]amino]-1-oxooctyl]amino]- N'-[N-[3.beta.-Hydroxylup-20(29)-en-28-oyl]-8-aminooctanoyl]-4-aminobutryic acid