(4R)-N-(tert-Butyl)-3-{(2S,3S)-2-hydroxy-3-[((2S)-2-{[(1-naphthyloxy)acetyl]amino}-4-pentynoyl)amino]-4-phenylbutanoyl}-1,3-thiazolidine-4-carboxamide 1Nap-O-CH2CO-Prg-(2S,3S)-AHPBA-Thz-NH-tBu AIDS-163745 AIDS163745