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Representative total ion chromatograms of the methanol extracts of green perilla leaves obtained by UPLC-ESI-Q-TOF/MS in negative ion mode: (A) Doryong sample. (B) Sinseong sample. (C) Bongmyeong sample. UPLC-ESI-Q-TOF/ MS = ultra high performance liquid chromatography coupled with electrospray ionization quadrupole time-of-flight mass spectrometry.
