The author contributed equally to this work. Department of Chinese Pharmaceutical Sciences and Chinese Medicine Resources, College of Pharmacy, China Medical University, Taichung 402, Taiwan ...

Department of Chemistry, Faculty and Graduate School of Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan, Department of Chemistry, Graduate School of Science, Osaka ...

DSM Pharmaceutical Products, Innovative Synthesis and Catalysis, P.O. Box 16, 6160 MD Geleen, The Netherlands, DSM Fine Chemicals Austria, P.O. Box 296, 4021 Linz ...