(R)-3-((2S,3S)-2-Hydroxy-3-{(S)-3-methoxy-2-[2-(naphthalen-1-yloxy)-ethanoylamino]-butanoylamino}-4-phenyl-butanoyl)-thiazolidine-4-carboxylic acid tert-butylamide 1Nap-O-CH2CO-Thr(Me)-(2S,3S)-AHPBA-Thz-NH-tBu AIDS-163739 AIDS163739