Yonetani-Theorell plot for inhibition of HIV-1 RT-RNase H activity in the presence of β-thujaplicinol and (a) Compound 9 or (b) Compound 29. The inhibitory activity (defined as V0/Vi) for each concentration of β-thujaplicinol (β-TP: 0, 0.125, 0.25, 0.5, and 1 μM) is plotted as a function of the concentrations of the thienopyrimidinone inhibitors (0, 0.625, 1.25, 2.5, and 5 μM). The assay was performed at fixed concentrations of substrate and enzyme (250 nM and 17 nM, respectively).