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2. For example, Chen, H. M.; Cai, M. S.; Jia, Z. J. Phytochemistry 1997, 45, 1441–1444; Moriyama, Y.; Takahashi, T. Bull. Chem. Soc. Jpn. 1976, 49, 3196–3199.
3. For example, Lin, Y. L.; Ou, J. C.; Chrn, C. F.; Kuo, Y. H. Chem. Pharm. Bull. 1998, 46, 1807–1809; Yaoita, Y.; Kikuchi, M. Chem. Pharm. Bull. 1996, 44, 1731–1735.
4. For example, Nagano, H.; Moriyama, Y.; Tanahashi, Y.; Takahashi, T. Bull. Chem. Soc. Jpn. 1974, 47, 1994–1998; Nagano, H.; Takahashi, T. Bull. Chem. Soc. Jpn. 1972, 45, 1935–1936.
5. For example, Torres, P.; Ayala, J.; Grande, C.; Maı́as, M. J.; Grande, M. Phytochemistry 1998, 47, 57–61.