1. Nutrient/Drug Metabolism and Pharmacology, Otsuka Pharmaceutical Factory, Inc., 115 Tateiwa, Muya-cho, Naruto, Tokushima 772-8601, Japan, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan, and Showa Pharmaceutical University, Machida, Tokyo 194-8543, Japan