1. Biotechnology Frontier Project, Toyobo Co., Ltd., 10-24 Toyo-cho, Tsuruga, Fukui 914-0047, Japan, Department of Applied Chemistry Faculty of Engineering, Kyushu University, 6-10-1 Hakozaki Higashi-ku, Fukuoka 812-8581, Japan, and Department of Functional Molecular Science, Division of Medicinal Chemistry, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi Minami-ku, Hiroshima 734-8551, Japan