1-[2-[N-(alpha.,.alpha.-Dimethylbenzyl)-N-(3,4-dihydroxybutyl)carbamoyl]-4-methylphenyl]-4-[2-[N-(1-ethylcyclopentyl)-N-(2-hydroxyethyl)carboxamido]phenyl]-2-butanol AG1132 analog AIDS-028323 AIDS028323 cPen-Butamide, 2OHBu deriv.