Determination of gentiopicroside, paeoniflorin, and salvianolic acid B in Qianggan Capsule by HPLC Determination of gentiopicroside, paeoniflorin, and salvianolic acid B in Qianggan Capsule by HPLC HPLC fingerprint of Qianggan Capsule Clinical study of treatment nonalcoholic fatty liver with Qianggan capsule