1. Hanyang University, Department of Chemistry and Applied Chemistry, Ansan, Sangrok-Gu, Sa-3-Dong 1271, Kyunggi-Do 426-791, Korea, Laboratory of Radiopharmaceuticals and Laboratory of Nuclear Medicine, Korea Institute of Radiological and Medical Sciences, 215-4 Gongneungdong, Nowongu, Seoul 139-706, Korea, and DMPK Team, Drug Discovery Laboratory, Central Research Institute, Choongwae Pharma Corporation, 146-141 Annyung-Dong, Hwasung-City, Kyunggi-Do, 445-976, Korea