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(a) Extracted ion chromatogram of apigenin C-hexoside-C-pentoside isomers (m/z: 565.15574) in positive ion mode (56-day-old in vitro sample). (b) MS2 spectrum of apigenin C-hexoside-C-pentoside isomer 1 in positive mode at a retention time of 20.41 min (56-day-old in vitro sample).
