1. Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560, Japan
2. Laboratory of Chemical Physics, Faculty of Applied Biological Science, Hiroshima University, Higashihiroshima, Hiroshima 724, Japan
3. Oleochemical Research Laboratory, NOF Corporation, Ohama, Amagasaki, Hyogo 660, Japan