Simultaneous determination of chlorogenic acid, aesculetin, isochlorogenic acid B, and isochlorogenic acid A in Cichorii Herba by QAMS Preparation technology of isochlorogenic acids A, B, and C Analysis on chemical constituents in Bupleuri Radix by HPLC-Q-TOF-MS Study on optimal harvest period of Lonicera Flos(Lonicera macranthoides)