Reverse transcriptase-IN-1 (Compound 12z), a diarylbenzopyrimidine (DABP) analogue, is a potent, orally active HIV-1 nonnucleoside reverse transcriptase inhibitor. Reverse transcriptase-IN-1 has antiviral activity with EC 50 values of 3.4 nM, 4.3 nM and 3.6 nM for HIV-1 III B , E138K and K103N mutants, respectively. Reverse transcriptase-IN-1 also has an IC 50 of 13.7 nM against HIV-1 reverse transcriptase enzyme.