4-[N-(3-{(4R)-4-[N-(tert-Butyl)carbamoyl](1,3-thiazolidin-3-yl)}(1S,2S)-2-hydroxy-3-oxo-1-benzylpropyl)carbamoyl]-4-oxobutanoic acid AIDS-104304 AIDS104304 N-(4-Carboxy-2-oxobutyanoyl)-Apns-Thz-NH-tert-butyl