Affiliation: | 1. Discovery Research Laboratories II, Eisai Co., Ltd. 5‐1‐3 Tokodai, Tsukuba, Ibaraki, 300‐2635, Japan, Fax: (+81)?29‐847‐4012;2. Tsukuba Chemical Research, API Research Laboratories, Eisai Co., Ltd., Japan;3. Structural Analysis Section, Analytical Research Laboratories, Eisai Co., Ltd., Japan |