Li, Fei, et al. “Screening and Identification of Multi Compounds in Yitongshu Injection Using Combination of Liquid Chromatography Time-of-Flight Tandem Mass Spectrometry”. Asian Journal of Chemistry, vol. 23, no. 11, Sept. 2011, pp. 4799-04, https://asianpubs.org/index.php/ajchem/article/view/10986.