“Correlation in quality and metabolism” of multicomponents in Angelicae Sinensis Radix Effects of Puerariae Lobatae Radix and Glycyrrhizae Radix et Rhizoma in Gegen Qinlian Decoction on rat liver metabolism of active ingredients in Scutellaria Radix Effects of Puerariae Lobatae Radix and Glycyrrhizae Radix et Rhizomain Gegen Qinlian Decoction on rat liver metabolism of active ingredients in Scutellaria Radix