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Extraction ion chromatograms (EIC) of the six compounds and three internal standard (ISs): (A) blank plasma; (B) blank plasma spiked with the analytes at LLOQ and IS; (C) plasma samples 0.5 h after oral administration of the ZSS aqueous extract. 3.20 min: coclaurine; 4.08 min: magnoflorine; 6.14 min: spinosin; 8.14 min: 6‴-feruloylspinosin; 10.77 min: jujuboside A; 11.14 min: jujuboside B; 10.20 min: IS1; 4.66 min: IS2; 11.10 min: IS3.
