1. Hacettepe University, Faculty of Pharmacy, Department of Pharmacognosy, TR-06100 Ankara, Turkey
2. Nagoya City University, Graduate School of Pharmaceutical Sciences, Tanabe-dori 3-1, Mizuho-ku, Nagoya 467-8603, Japan
3. Present address: Meijo University, Faculty of Pharmacy, 150 Yagotoyama, Tenpaku-ku, Nagoya 468-8503, Japan