1. Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, Japan 770-8514
2. Daiichi University of Pharmacy, 22-1 Tamagawa-cho Minami-ku, Fukuoka 815-8511, Japan
3. Institute of Natural Medicine, University of Toyama, 2630-Sugitani, Toyama 930-0194, Japan
4. College of Pharmacy, The Ohio State University, 217 Lloyd M, Parks Hall, 500 West 12th Avenue, Columbus, OH 43210, USA