Preparation technology of isochlorogenic acids A, B, and C HPLC fingerprint and pattern recognition of Deng’s Herbal Tea Granula HPLC fingerprint and pattern recognition of Deng’s Herbal Tea Granula Simultaneous determination of chlorogenic acid, aesculetin, isochlorogenic acid B, and isochlorogenic acid A in Cichorii Herba by QAMS Chemical constituents in stems of Ilex cornuta