Institution: | 1. Division of Mass Spectrometry, Korea Basic Science Institute, 804-1 Yangcheong-Ri, Ochang-eup, Cheongwon-Gun 363-883, Republic of Korea;2. Department of Chemistry, Yonsei University, Seoul 120-749, Republic of Korea;3. Graduate School of Science and Technology, Chungnam National University, Daejeon 305-333, Republic of Korea |