1-{(2S,3S)-3-[(tert-Butoxycarbonyl)amino]-2-hydroxy-4-phenylbutanoyl}-L-prolyl-N1-(cyclohexylmethyl)-L-glutamamide AIDS-163652 AIDS163652 Boc-(2S, 3S)-AHPBA-Pro-Gln-NH-CH2-C6H11