Fig. 9From: Utility of sustainable ratio derivative spectrophotometry for the concurrent assay of synergistic repurposed drugs for COVID-19 infections; Insilico pharmacokinetics proofZero-order spectra of FVM (5, 10, 20 μg/mL) and IVM (2.5, 10, 15 μg/mL) showing the selected wavelengths for DWZM using methanol as a blankBack to article page