1. Department of Chemistry “G. Ciamician”, University of Bologna, Via Selmi 2, I-40126 Bologna, Italy
2. Bioanalytical Mass Spectrometry Laboratory, Interdepartmental Center for Biotechnology Research, University of Bologna, Via Irnerio 46, I-40126 Bologna, Italy
3. Department of Pharmaceutical Sciences, University of Bologna, Via Belmeloro 6, 40126 Bologna, Italy
4. Department of Chemistry, Yonsei University, Seoul 120-749, Korea
5. Department of Chemical Engineering, Yonsei University, Seoul 120-749, Korea