1. Department of Chemistry, University of Tromsø, N-9037 Tromsø, Norway, Department of Chemistry, University of Oslo, Box 1033 Blindern, N-0315 Oslo, Norway, and Department of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warszawa, Poland
2. Department of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warszawa, Poland, and Department of Chemistry, University of Tromsø, N-9037 Tromsø, Norway
3. Department of Chemistry, University of Oslo, Box 1033 Blindern, N-0315 Oslo, Norway
4. Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44, 01-224 Warszawa, Poland