[4] [4] Dixon R A, Ferreira D. Phytochemistry,2002,60:2051.

[5] [5] Fritz W, Coward L, Wang J. Carcinogenesis,1998,19:2151.

[6] [6] Ou S Y, Kwok K C. J. Sci. Food Agric.,2004,84:1261.

[7] [7] Yang Y M, Hu Q L, Fan Y L, et al. Spectrochim. Acta Part A,2008,69:432.

[9] [9] Lewis P T, Wāhālā K, Hoikkala A, et al. Tetrahedron,2000,56:7805.

[10] [10] Kandagal P B, Shaikh S M T, Manjunatha D H, et al. J. Photochem. Photobiol. A 2007,189:121.

[11] [11] Ni Y N, Liu G L, Kokot S. Talanta,2008,76:513.

[12] [12] Xiao J B, Chen J W, Cao H, et al. J. Photochem. Photobiol. A,2007,191:222.

[13] [13] Saboury A A. J. Iran Chem. Soc.,2006,3:1.

[14] [14] Tang J H, Luan F, Chen X G. Bioorganic and Medicinal Chemistry,2006,14(9):3210.

[17] [17] Wu F Y, Ji Z J, Wu Y M, et al. Chem. Phys. Lett.,2006,424:387.

[18] [18] Wei Y L, Li J Q, Dong C, et al. Talanta,2006,70:377.