1-Piperazinecarboxylic acid, 4-[5-[3-cyclohexyl-6,9-bis(cyclopropylmethyl)-19,19-dimethyl-1,4,7,10,11,14,17-heptaoxo-16-phenyl-18-oxa-2,5,8,12,15-pentaazaeicos-1-yl]-2-pyridinyl]-, ethyl ester AIDS-115690 AIDS115690