Determination of forsythoside A in fructus forsythiae by NIR Study on in situ intestinal absorption of active ingredients in Shuanghuanglian oral liquid in rats Determination of phillyrin and forsythoside A in Lianqiao Bingdu Qing capsule by RP-HPLC Simultaneous determination of 17 major components of Shuang-Huang-Lian Oral Liquid by UPLC-MS/MS Quantitative determination of forsythiaside in Forsythia suspensa