150840-70-3 AIDS-033487 AIDS033487 Betulinic acid NH-BuCONH-BuCOOH deriv. N'-[N-[3.beta.-Hydroxylup-20(29)-en-28-oyl]-5-aminopentanoyl]-5-aminopentanoic acid Pentanoic acid, 5-[[5-[[(3.beta.)-3-hydroxy-28-oxolup-20(29)-en-28-yl]amino]-1-oxopentyl]amino]-