1. VERIFIN, Finnish Institute for Verification of the Chemical Weapons Convention, Department of Chemistry, University of Helsinki, FI-00014 Helsinki, Finland
2. Drug Research Program and Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, P.O. Box 56, FI-00014 Helsinki, Finland
3. Department of Chemistry, Faculty of Science, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland
4. Department of Chemistry and Biochemistry, New Mexico State University, 1175 N Horseshoe Drive, Las Cruces, New Mexico 88003, United States