1. Ding HS (1982) The Chinese medicinal cryptogam, 1st edn. Shanghai Scientific and Technical Publisher, p 104
2. Gong XL, Chen ZH, Liang NC (2007) China J Chin Mater Med 32:1382–1387
3. Aoyama K, Tanaka N, Suzuki N (1977) Chem Pharm Bull 25:2461–2464
4. Zhang Q, Xuan LJ (2007) Chin Chem Lett 18:1386–1388
5. Li JH, Liang NC, Mo LE, Zhang X, He CW (1998) Acta Pharm Sin 33:641–644