Determination of berberine hydrochloride, epiberberine, jatrorrhizine, palmatine, and glyeyrrhizinate in Coptidis Rhizoma Compound Decoction by HPLC Determination of berberine hydrochloride, epiberberine, jatrorrhizine, palmatine, and glyeyrrhizinate in Coptidis Rhizoma Compound Decoction by HPLC