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Inhibition of wild-type HIV-1 protease (PRWT) enzymatic activity by GRL-057-14, GRL-058-14, GRL-059-14, APV, and DRV. All the compounds tested completely blocked PRWT activity at 100 nM and beyond. GRL-057-14 inhibited PRWT activity with an IC50 of 0.22 nM and a Morrison Ki of 0.10 nM.