174740-63-7 AIDS-033496 AIDS033496 Betulinic acid NH-HepNHCOPrCOOH deriv. Pentanoic acid, 5-[[7-[[(3.beta.)-3-hydroxy-28-oxolup-20(29)-en-28-yl]amino]heptyl]amino]-5-oxo- [[N-[3.beta.-Hydroxylup-20(29)-en-28-oyl]-7-aminoheptyl]carbamoyl]butanoic acid