4-Hydroxy-2,6-bis(phenylmethyl)-N,N'-bis[2-[2-[(1,1-dimethylethoxy)carbonyl]amino]cyclohexyl]heptanediamide, [1-S-[1.alpha.[2S*,6*,7(1R*,2R*)]2.beta.]] AIDS-005967 AIDS005967 HepdiCON, c-Hex deriv.