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009 and 0.342%. In this way, combined with chemometrics 1H HR-MAS NMR proved to be suitable for the qualitative and quantitative study of Passiflora biomarkers, using a minimal pre-treatment of the sample. V.Two new phthalideisoquinoline hemiacetal alkaloid derivatives, named corybensines A and B (1 and 2), and four known alkaloids (3-6) were isolated from the bulbs of Corydalis decumbens. Their structures were characterized by analysis of 1D/2D NMR and ECD data, quantum chemical ECD calculations, and by X-ray diffraction analysis. Among them, compound 2 re
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