(4R)-N'-[N-3.beta.-Hydroxylup-20(29)-en-28-oyl]-8-aminooctanoyl]-4-amino-6-methylheptanoic acid 174740-57-9 AIDS-033515 AIDS033515 Betulinic acid NH-HepCONHPrCOOH deriv. Heptanoic acid, 4-[[8-[[(3.beta.)-3-hydroxy-28-oxolup-20(29)-en-28-yl]amino]-1-oxooctyl]amino]-6-methyl-