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(a) HPLC-ESI-MS chromatogram of G. asclepiadea herb extract in SIM-mode (m/z 421, 583). (b, c) Mass spectra (negative ionization) of compounds 49 (mangiferin) and 29 (mangiferin-7-O-glucoside), respectively. (d) UV spectra of compounds 29, 49, and 50.
