150840-26-9 AIDS-033476 AIDS033476 Betulinic acid NH-BuCOOH deriv. N-[3.beta.-Hydroxylup-20(29)-en-28-oyl]-5-aminopentanoic acid Pentanoic acid, 5-[[(3.beta.)-3-hydroxy-28-oxolup-20(29)-en-28-yl]amino]-