AIDS-033449 AIDS033449 Aspns-Thz-NH-t-Bu deriv. KNI-550 Pentanoic acid, 5-[[(1S,2S)-3-[(4R)-4-[[(1,1-dimethylethyl)amino]carbonyl]-3-thiazolidinyl]-2-hydroxy-3-oxo-1-(phenylmethyl)propyl]amino]-2,2-dimethyl-5-oxo-