1. Department of Polymer Chemistry, Kyoto University, Kyoto 615-8510, Japan
2. Department of Applied Chemistry, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
3. Osaka Organic Chemical Industries Ltd., 7-20 Azuchi-Machi, 1-Chome, Chuo-ku, Osaka 541-0052, Japan