Simultaneous isolation and purification of gallic acid and brevifolincarboxylic acid from Polygonum capitatum by high-speed counter-current chromatography Chemical constituents from roots of Ricinus communis Chemical constituents from roots of Ricinus communis Studies on the chemical constituents in herb of Ludwigia octovalvis Chemical constituents in aerial parts of Polygonum capitatum Protecting effect of brevifolin and 8,9-single-epoxy brevifolin of Phyllanthus simplex on rat liver injury Studies on Chemical Constituents of Phyllanthus urinaria L. and its Antiviral Activity against Hepatitis B Virus Study on chemical constituents of Potentilla discolor Determination of four phenolic acids in Phyllanthus urinaria from different habitats Determination of four phenolic acids in Phyllanthus urinaria from different habitats