1. Central Customs Laboratory, Ministry of Finance, 6-3-5, Kashiwanoha, Kashiwa-shi, Chiba 277-0882, Japan, Narcotic Control Department, Kanto-Shin'etsu Regional Bureau of Health and Welfare, Ministry of Health, Labor and Welfare, 2-4-14, Nakameguro, Meguro-ku, Tokyo 153-0061, Japan, Tsukuba Medical Plant Research Station, National Institute of Health Sciences, Ministry of Health, Labor and Welfare, 1, Hachimandai, Tsukuba-shi, Ibaraki 305-0843, Japan, and Graduate School of Pharmaceutical Sciences, The...