173106-37-1 AIDS-033531 AIDS033531 Betulinic acid, 11-aminoundecanoate deriv. N-[3.beta.-Hydroxy-30-[[(2,2-diethylamino)ethyl]thio]lup-20(29)-en-28-oyl]-11-aminoundecanoic acid Undecanoic acid, 11-[[(3.beta.)-30-[[2-(diethylamino)ethyl]thio]-28-oxolup-20(29)-en-28-yl]amino]-