Chien, Ching-Ting; Tsai, Chia-Chung; Tsai, Chi-Hui; Chang, Tsai-Yuan; Tsai, Ping-Kuei; Wang, Ying-Chuan; Yan, Tu-Hsin Journal of Organic Chemistry, 2006 , vol. 71, # 11 p. 4324 - 4327