4-Hydroxy-2,6-bis(phenylmethyl)-N,N'-bis[2-[(2-pyridinylcarbonyl)amino]cyclohexyl]heptanediamide, [1-S-[1.alpha.[2S*,6S*,7(1R*,2R*)]2.beta.]] AIDS-005963 AIDS005963 HepdiCO2N, Pyrid, c-Hex deriv.