1. S. Cheenpracha, T. Ritthiwigrom, C. Karalai, and S. Laphookhieo, Phytochem. Lett., 5, 708 (2012).
2. S. Saha, H. Mondal, F. Hossain, M. Anisuzzman, M. M. Hasan, and G. A. Cordell, Phytopharmacology, 4, 291 (2013).
3. P. H. Ho, An Illustrated Flora of Vietnam, 2nd ed., Vol. 1, Youth Publisher, Ho Chi Minh City, Vietnam, 2000, pp. 878–889.
4. H. Wang, W. H. Dong, W. J. Zuo, S. Liu, H. M. Zhong, W. L. Mei, and H. F. Dai, Fitoterapia, 95, 16 (2014).
5. J. Jakupovic, L. Lehmann, F. Bohlmann, and A. Hogdson, Phytochemistry, 26, 2854 (1987).