Li, Kaitong, et al. “Chemical Fingerprint and Metabolic Fingerprint Analysis of the Medicinal Extract of Corydalis Yanhusuo by HPLC-UV and HPLC-MS Methods”. Asian Journal of Chemistry, vol. 23, no. 2, Oct. 2010, pp. 723-8, https://asianpubs.org/index.php/ajchem/article/view/15829.