1. Division of Organic Chemistry, Department of Chemistry, Graduate School of Science and Technology; Kumamoto University; 2-39-1, Kurokami Chuo-ku Kumamoto 860-8555 Japan
2. Division of Computational Chemistry, Graduate School of Science and Engineering; Yamaguchi University; 2-16-1, Tokiwadai Ube Yamaguchi 755-8611 Japan
3. Graduate School of Pharmaceutical Sciences; Osaka University; 1-6 Yamada-oka Suita Osaka 565-0871 Japan
4. Division of Physical Chemistry, Department of Chemistry; Graduate School of Science and Technology; Kumamoto University; 2-39-1, Kurokami Chuo-ku Kumamoto 860-8555 Japan