150840-28-1 AIDS-033478 AIDS033478 Betulinic acid NH-HexCOOH deriv. Heptanoic acid, 7-[[(3.beta.)-3-hydroxy-28-oxolup-20(29)-en-28-yl]amino]- N-[3.beta.-Hydroxylup-20(29)-en-28-oyl]-7-aminoheptanoic acid