1. Faculty
of Pharmacy, Meijo University, Nagoya 468-8503, Japan
2. Division
of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
3. Department
of Botany, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
4. Biological
Laboratory, Kansai Medical University, Hirakata, Osaka 573-1136, Japan