1. Department of Chemistry, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8551, Japan
2. Biotechnology Research Center, Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
3. Institute of Organic Chemistry, University of Vienna, Währingerstraße 38, A-1090 Vienna, Austria