1. Division of Molecular Target and Gene Therapy Products, National Institute of Health Sciences, Kawasaki, Kanagawa 210-9501, Japan
2. Modality Research Laboratories, Biologics Division, Daiichi Sankyo Co., Ltd., Tokyo 140-8710, Japan
3. Medicinal Chemistry Research Laboratories, R&D Division, Daiichi Sankyo Co., Ltd., Tokyo 140-8710, Japan
4. Division of Organic Chemistry, National Institute of Health Sciences, Kawasaki, Kanagawa 210-9501 Japan
5. Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan