1. Laboratory for Chemistry and Life Science, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan
2. Department of Frontier Materials Chemistry, Faculty of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
3. Chemicals Research and Development Department, Isoprene Chemicals Division, Kuraray Co., Ltd., 41 Miyukigaoka, Tsukuba, Ibaraki 305-0841, Japan
4. Quality Management and Product Development Department, Isoprene Chemicals Division, Kuraray Co., Ltd., Ote Center Building, 1-1-3 Otemachi, Chiyoda-ku, Tokyo 100-8115, Japan