173106-39-3 AIDS-033533 AIDS033533 Betulinic acid, 11-aminoundecanoate deriv. N-[3.beta.-Hydroxy-30-[(4'-fluorophenyl)thio]lup-20(29)-en-28-oyl]-11-aminoundecanoic acid Undecanoic acid, 11-[[(3.beta.)-30-[(4-fluorophenyl)thio]-3-hydroxy-28-oxolup-20(29)-en-28-yl]amino]-