AIDS-033447 AIDS033447 Aspns-Thz-NH-t-Bu deriv. Butanoic acid, 4-[[(1S,2S)-3-[(4R)-4-[[(1,1-dimethylethyl)amino]carbonyl]-3-thiazolidinyl]-2-hydroxy-3-oxo-1-(phenylmethyl)propyl]amino]-2-(1-methylethyl)-4-oxo- KNI-548