Determination of peoniflorin, naringin, aurantiamarin, neohesperidin, and ammonium glycyrrhizinate in Sini Powder by HPLC-"internal standard" multi-control method The effect of four kinds of traditional Chinese herbal compound on the experimental acute stress behaviors and the hypothalamus pituitary-adrenal gland axis Material basis of Sini Powder with sedative-hypnotic effect Material basis of Sini Powder with sedative-hypnotic effect