4-Hydroxy-2,6-bis(phenylmethyl)-N,N'-bis[2-[(2-acetylamino)cyclohexyl]heptanediamide, [1-S-[1.alpha.[2S*,6*,7(1R*,2R*)]2.beta.]] AIDS-005966 AIDS005966 HepdiCON, c-Hex deriv.