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(a) HPLC-ESI-MS chromatogram of G. gelida herb extract in SIM-mode (m/z 771). (b, c) UV spectra of compounds 36 and 73. (d) MSn spectra (negative ionization) of compound 36. Lut-C-Hex-O-Hex-O-Hex—zone of isomeric luteolin-C-hexoside-O-hexoside-O-hexosides, Lut-C-Hex-O-Hex-O-Caf—zone of isomeric luteolin-C-hexoside-O-hexoside-O-caffeates.
