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Typical MRM chromatograms of plasma samples collected 180 min after oral administration of the herbal formula Yin-Chen-Hao-Tang (3 g/kg): (a) scoparone (6.2 ng/mL) RT: 5.6 min, (b) geniposide (287.4 ng/mL) RT: 5.1 min, (c) rhein (350.3 ng/mL) RT: 7.4 min and (d) internal standard: Carbamazepine (10 ng/mL) RT: 6.2 min.
