1-Piperazinecarboxylic acid, 4-[5-[16-carboxy-3-cyclohexyl-6,9-bis(cyclopropylmethyl)-1,4,7,10,11,14-hexaoxo-16-phenyl-2,5,8,12,15-pentaazahexadec-1-yl]-2-pyridinyl]-, ethyl ester AIDS-115691 AIDS115691