Chung, Ill-Min, et al. “Isolation and Cytotoxic Activity of Acyclic Triterpene Callicarpenol from Callicarpa Macrophylla”. Asian Journal of Chemistry, vol. 17, no. 3, May 2016, pp. 1907-14, https://asianpubs.org/index.php/ajchem/article/view/14055.