Pharmacokinetic and excretion study of three secoiridoid glycosides and three flavonoid glycosides in rat by LC-MS/MS after oral administration of the Swertia pseudochinensis extract - Sheng, N; Zhi, X; Yuan, L; Zhang, Z; Jia, P; Zhang, X; Zhang, L; Wang, X (J Chromatogr B Analyt Technol Biomed Life Sci, 2014)