Fig. 2

Chromatograms of mixed standards (Peak 1, gallic acid; Peak 2, chlorogenic acid; Peak 3, puerarin; Peak 5, paeoniflorin; Peak 6, ferulic acid; Peak 7, fangchinoline; Peak 8,  tetrandrine; Peak 9, ligustrone I; and Peak 10, benzoyl paeoniflorin).