1. VERIFIN, Finnish Institute for Verification of the Chemical Weapons Convention, Department of Chemistry, University of Helsinki, Helsinki, Finland
2. Drug Research Program and Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
3. Department of Chemistry, Faculty of Science, University of Helsinki, Helsinki, Finland
4. Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico, USA