1. Remya Vijayakumar, Chang-Xing Zhao, and Rengasamy Gopal, C. R. Biologies, 332, 52 (2009).
2. N. G. Bisset and J. D. Phillipson, Lloydia, 39, 263 (1976).
3. H. Wu, B. C. Cai, and P. X. Zheng, J. Chin. Herb. Med., 19, 277 (1994).
4. B. C. Cai, X. W. Yang, M. Hattori, and T. Namba, Jpn. J. Pharmacogn., 44, 42 (1990).
5. W. Klyne and J. Buckingham, Atlas of Stereochemistry, Chapman and Hall, 1974, p. 150.