1. Department of Applied Chemistry and Center for Advanced Science and Innovation, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan
2. Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC, Canada V8W 3V6
3. Bio/Fine Chemicals Department, Nagase ChemteX Corporation, 2-2-3 Murotani, Nishi-ku, Kobe 651-2241, Japan