AIDS-005334 AIDS005334 Cyclohexanehexamide, .delta.-[[[(N-1-naphthyloxy)acetyl]valinyl]amino]-.gamma.-hydroxy-.alpha.-(1-methylethyl)-N-[2-methyl-1-[[(2-pyridinylmethyl)amino]carbonyl]butyl] U-81749E analog psi-[CHOHCH2] Val-cHexAla Val-Ile isostere