.beta.-Alanine, N-[7-[[(3.beta.)-3-hydroxy-28-oxolup-20(29)-en-28-yl]amino]-1-oxoheptyl]- 150840-71-4 AIDS-033489 AIDS033489 Betulinic acid NH-HexCONHEtCOOH deriv. N'-[N-[3.beta.-Hydroxylup-20(29)-en-28-oyl]-7-aminoheptanoyl]-3-aminopropionic acid