Tu, Zhijay; Rama Raju; Liou, Tzuo-Rung; Kavala, Veerababurao; Kuo, Chun-Wei; Jang, Yaochung; Shih, Yu-Hsuan; Wang, Chun-Chao; Yao, Ching-Fa Tetrahedron, 2009 , vol. 65, # 12 p. 2436 - 2442