Contribution from the Department of Chemistry, Faculty of Science, Saitama University, Urawa, Saitama 338-8570, Japan, Sagami Chemical Research Center, Nishi-Ohnuma, Sagamihara, Kanagawa 229-0012, Japan, Department of Chemistry, Nara University of Education, Takabatake-cho, Nara 630-8528, Japan, and Institute for Natural Science, Nara University, Misasagi-cho, Nara 631-8502, Japan(1999-05-01時点)