1. Department of Chemistry; Chungnam National University; Daejeon; 305-764; Republic of Korea
2. Dong-il Shimadzu Corp.; Seoul; 135-010; Republic of Korea
3. Korea Basic Science Institute; 804-1 Yangcheong-Ri, Ochang-Myun; Cheongwon-Gun; Chungcheongbuk-Do; 363-883; Republic of Korea