The structure-activity relationships and pharmacophore modeling aspect
s of a series of HIV PR inhibitors modified at the N- and/or C-terminu
s of the dipeptide isostere ChaPSI[CH(OH)CH2]Val (Cha. cyclohexylalani
ne) are reported. The HIV PR binding affinity-selectivity (vs. human r
enin, pepsin, and cathepsins-D and E), antiviral efficacy (HIV-1/vVK-1
infected CV-1 cells) and cellular permeabilities (Caco-2) are noted.