(A) Absorbance spectra of compounds C, F, G and H. (B) Fluorescence spectra of DENV2 protease (2μM) with various concentrations of compounds, C, F, G and H. (C) Competition of BPTI on the fluorescence quenching in the presence of 50 μM compound and 10 μM BPTI. (D) Kinetic analysis of compounds C, F and G. Lineweaver-Burk (LB) plots, of compounds, C, F, and G.