HIV-1 inhibitor-8 is an orally active, low-toxicity and potent HIV?1 non-nucleoside reverse transcriptase inhibitor (NNRTI). HIV-1 inhibitor-8 yields exceptionally potent antiviral activities (EC50=4.44~54.5 nM) against various HIV?1 strains. The IC50 of HIV-1 inhibitor-8 against WT HIV-1 reverse transcriptase is 0.081 μM[1].

HIV-1 inhibitor-8 yields exceptionally potent antiviral activities (EC50=4.44~54.5 nM) against various HIV-1 strains and improves resistance profiles (RF = 0.5~5.6). HIV-1 inhibitor-8 exhibits reduces cytotoxicity (CC50=284 μM) and higher SI values (SI = 5210~63992). HIV-1 inhibitor-8 displays better solubility (sol. =12.8 μg/mL) and no significant inhibition of the main CYP enzymes. HIV-1 inhibitor-8 displays an extremely low hERG inhibition with an IC50 value of 19.84 μM in CHO-hERG cells.

HIV-1 inhibitor-8 (2 mg/kg; i.v.) shows a favorable mean CL, volume of distribution and a long terminal half-life[1].HIV-1 inhibitor-8 (20 mg/kg; p.o.) absorption reaches maximum at 0.25 hours with a plasma concentration value of 16.6 ng/mL and the mean residence time is 2.90 hours[1].

[1]. Wang Z, et al. Discovery of Novel Dihydrothiopyrano[4,3-d]pyrimidine Derivatives as Potent HIV-1 NNRTIs with Significantly Reduced hERG Inhibitory Activity and Improved Resistance Profiles [published online ahead of print, 2021 Aug 25]. J Med Chem. 2021;10.1021/acs.jmedchem.1c01015.