1. Department of Chemistry, Laboratory of Organic Chemistry, University of Helsinki, A. I. Virtasen aukio 1, FIN-00014, Finland
2. Environmental Laboratory of Helsinki, Helsinginkatu 24, 00530, Helsinki, Finland
3. The Finnish Research Project on the Verification of Chemical Disarmament, Department of Chemistry, University of Helsinki, (A. I. Virtasen aukio 1, FIN-00014, Finland