AIDS-005333 AIDS005333 Cyclohexanehexamide,.delta.-[[[(N-1-naphthyloxy)acetyl]-N-methylhistidinyl]amino].gamma.-hydroxy-.alpha.-(1-methylethyl)-N-[2-methyl-1-[[(2-pyridinylmethyl)amino]carbonyl]butyl] U-81749E analog psi-[CHOHCH2] His-cHexAla Val-Ile isostere