1. Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan
2. National Food Research Institute, National Agriculture and Food Research Organization, Tsukuba, Ibaraki 305-8642, Japan
3. KURABO Industries, LTD., Shimokida-cho, Neyagawa, Osaka 572-0823, Japan