11-[[3.beta.-Hydroxylup-20(29)-en-28-oyl]oxy]undecanoic acid 173106-15-5 AIDS-033526 AIDS033526 Betulinic acid, undecanoate deriv. Lup-20(29)-en-28-oic acid, 3-hydroxy-, 10-carboxydecyl ester, (3.beta.)-