1. Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Republic of Korea
2. Division of Magnetic Resonance, KBSI, Chungbuk 28119, Republic of Korea
3. College of Pharmacy, Dongguk University, Goyang, Gyeonggi-do 410-820, Republic of Korea
4. Department of Chemistry, Pukyong National University, Busan 48547, Republic of Korea