Tadakazu Tokumura1, Masaki Nanbas2, Yukl Tsushima1, Kimio Tatsuishi1, Masanori Kayano1, Yoshiharu Machida2, Tsuneji Nagai2
1Research Center of Technological Development,. Eisai Co., Ltd., Minami 2-3- 14, Honjo-shi, Saitama 367, Japan
2Faculty of Pharmaceutical Sciences, Hoshi University, Ebara 2-4-41, Shmagawa-ku, Tokyo 142, Japan