1H-Imidazole-4-propanamide, N-(2-hydroxy-5-amino-1-(2-methylpropyl)-4-[[[2-methyl-1-[[(2-pyridinylmethyl)amino]carbonyl]butyl]amino]carbonyl]hexyl]-.alpha.-[(phenyloxyacetyl)-amino]-, [1S-[1R*,2R*,4R*(1R*,2R*)]] AIDS-081449 AIDS081449 POA-His-LVA-Ile-Amp POA-His-Leu-.psi.[CH(OH)CH2]-Val-Ile-Amp