1. Department of Chemistry and Department of Chemistry and Materials Science, Graduate School
of Science and Engineering, Tokyo Institute of Technology, O-okayama 2-12-1, E1-9, Meguro-ku,
Tokyo 152-8551, Japan, National Institute of Advanced Industrial Science and Technology,
Onogawa 16-1, Tsukuba 305-8569, Japan, and School of Biological and Chemical Sciences,
Queen Mary, University of London, Mile End Road, London E1 4NS, U.K.