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From top to bottom, 1H-NMR spectra of Solidago virga-aurea (black), Peumus boldus (pink), Ononis spinosa (yellow), Epilobium angustifolium (red), and Phyllanthus niruri (green) extracts and gallic acid standard solution (blue). The gallic acid protons signal (H-2, H-6) is visible at 7.048 ppm and is detected in P. niruri and E. angustifolium extracts.
