Zhao, S. M., Kuang, B., Fan, J. T., Yan, H., Xu, W. Y., & Tan, N. H. (2011). Antitumor Cyclic Hexapeptides from Rubia Plants: History, Chemistry, and Mechanism (2005–2011). CHIMIA, 65(12), 952. https://doi.org/10.2533/chimia.2011.952