Department of Molecular Chemistry and Engineering, Faculty of Engineering, Tohoku University, Aoba, Aramaki, Aoba-ku, Sendai 980, Japan (M.O., K.A., K.Y.); and Analytical Center, Konica Corporation, No. 1 Sakura-machi, Hino-shi, Tokyo 191, Japan (Y.N.) (At 1993-09)
