1H-Imidazole-4-propanamide, N-(1-(cyclohexylmethyl)-2,3-dihydroxy-5-methyl-4-[[[2-methyl-1-[[(2-pyridinylmethyl)amino]carbonyl]butyl]-[amino]carbonyl]hexyl]-.alpha.-[2-(naphthalenyloxy)-acetyl]amino]-, [1S-[1R*(R*),2S*,3S*,4S*(1R*,2R*)]] AIDS-081456 AIDS081456 NOA-His-Cha.psi.[CH(OH)CH(OH)]Val-Ile-Amp