1,1-Dimethylethyl N-[4-(3,5-diaminobenzamido)-1,4-dibenzyl-3-hydroxybutyl]carbamate 3,5-diNH2 N-OHBu-BzNHPhCON, PhCH2 Boc deriv. AIDS-028159 AIDS028159 Benzamide hydroxyethyl analog