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1H NMR spectra of three Zanthoxylum species—Z. bungeanum (a, c), Z. schinifolium (d, e), and Z. piperitum (f, g)—and the structure of xanthoxylin (b). The 1H NMR spectra corresponding to the signals of 4-OCH3 and 6-OCH3 in (a), (d), and (f) were magnified to (c), (e), and (g), respectively.
