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Representative multiple reaction monitoring (MRM) chromatograms of scopoletin and xanthotoxin in rat plasma: (A) a blank plasma sample; (B) a blank plasma spiked with 100 ng/mL of scopoletin and internal standard; (C) a plasma sample collected 5 min after oral administration of scopoletin; (a) scopoletin-glucuronide conjugate; (b) scopoletin-sulfate conjugate.
