Wong, Fung Fuh; Chuang, Shih Hsien; Yang, Sheng-chuan; Lin, Yu-Hsiang; Tseng, Wen-Che; Lin, Shao-Kai; Huang, Jiann-Jyh Tetrahedron, 2010 , vol. 66, # 23 p. 4068 - 4072