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1H-NMR spectrum (400 MHz, CDCl3, δ-values in ppm) from a fraction of an extract of L. albus obtained during column chromatography, showing the characteristic peaks of five studied QAs. Line arrows indicate the corresponding peaks used for quantitation of albine, multiflorine, angustifoline, 13-OH-lupanine and lupanine (peak heights are not representative of the concentrations in the original plant extract).
