Niu, De-Yun, Yin-Ke Li, Xian-Xue Wu, Yun-Dong Shi, Qiu-Fen Hu, and Xue-Mei Gao. 2013. “Pterocarpan Derivatives from Clinopodium Urticifolium and Their Cytotoxicity”. Asian Journal of Chemistry 25 (17):9672-74. https://doi.org/10.14233/ajchem.2013.15127.