1. Basic Research Laboratory, Noevir Company, Ltd., Okada-cho 112-1, Youkaichi-shi 527, Japan, Oleochemical Research Laboratory, NOF Corporation, Ohama-cho 1−56, Amagasaki 660, Japan, and Graduate School of Engineering, Yokohama National University, Tokiwadai 79-5, Hodogaya-ku, Yokohama 240, Japan