1. Department
of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
2. Department
of Chemistry, School of Science and Technology, Kwansei Gakuin University, Gakuen 2-1, Sanda, Hyogo 669-1337, Japan
3. Institute
of Organic Chemistry and Biochemistry, Academy of Sciences, 166 10 Prague, Czech Republic