.Beta-Alanine, N-[(3.beta.)-3-hydroxy-28-oxolup-20(29)-en-28-yl]- 174740-41-1 AIDS-033474 AIDS033474 Betulinic acid NHEtCOOH deriv. N-[3.beta.-Hydroxylup-20(29)-en-28-oyl]-3-aminopropanoic acid