1. Department of Medicinal Chemistry, Faculty of Pharmacy, Meijo University, Tempaku, Nagoya 468-8503, Japan, Tokai Gakuen University, Tempaku, Nagoya 468-8514, Japan, Department of Analytical Neurobiology, Faculty of Pharmacy, Meijo University, Tempaku, Nagoya 468-8503, Japan, and Department of Pharmacognosy, Faculty of Pharmacy, Meijo University, Tempaku, Nagoya 468-8503, Japan