4-Hydroxy-2,6-bis(phenylmethyl)-N,N'-bis[2-[(3-pyridinylcarbonyl)amino]cyclohexyl]heptanediamide, [1-S-[1.alpha.[2S*,6*,7(1R*,2R*)]2.beta.]] AIDS-005964 AIDS005964 HepdiCO2N Pyrid c-Hex deriv.