Determination of five primary chemical constituents in Cassia angustifolia by HPLC Determination of anthraquinones and bianthrones in rhubarb from different sources by HPLC Simultaneous determination of eight components in Hedan Tablets by UPLC Determination of anthraquinones and bianthrones in rhubarb from different sources by HPLC High Performance Liquid Chromatographic Determination of Sennoside A in Maren Pills