Fig. 3From: Anti-dengue virus serotype 2 activity of tannins from porcupine dates1H-NMR spectra of a BDTF, b PDTF and c ST tannic acid. Lyophilized samples were dissolved in deuterated DMSO at 10 mg/mL. The proton shift of each sample was obtained using Bruker High resolution NMR Fourier 300 HD spectrometer (300 MHz). Similarity of major chemical shifts was observed in all three spectraBack to article page