1. Department
of Chemistry, Graduate
School of Science, Osaka University, 1-1
Machikaneyama-cho, Toyonaka-shi, Osaka 560-0043, Japan
2. RIKEN Center for Molecular Imaging Science, 6-7-3 Minatojima-minamimachi,
Chuo-ku, Kobe-shi, Hyogo 650-0047, Japan
3. Graduate School of Pharmaceutical
Sciences, Osaka University, 1-6 Yamada-oka,
Suita-shi, Osaka 565-0871, Japan