O Kodama1, W Xin Li1, S Tamogami1,2, T Akatsuka1. 1. a Laboratory of Bio-organic and Pesticide Chemistry, Faculty of Agriculture , Ibaraki University , 3998 Ami-machi, Ibaraki 300-03 , Japan. 2. b Central Research Laboratories, Idemitsu Kosan Co., Ltd ., 1280 Kami-izumi, Sodegaura-shi, Chiba 299-02 Japan.