[4] Wu W, Sun S Q, Zhou Q, et al. Journal of Pharmaceutical and Biomedical Analysis, 2008, 46: 498.
[6] Zhou Q, Sun S Q, Yu L, et al. Journal of Molecular Structure, 2006, 799: 77.
[7] Xu C H, Sun S Q, Guo C Q , et al. Vibrational Spectrosocopy, 2006, 41: 118.
[8] Noda I. J. Am. Chem. Soc., 1989, 111(21): 8116.
[9] Noda I. Appl. Spectrosc., 1990, 44(4): 550.
[10] Noda I. Appl. Spectrosc., 1993, 47: 1329.
[13] Foo L Y, Porter L J. Phytochemistry, 1980, 19(8): 1747.