1. Institute of Organic Chemistry, Polish Academy of Sciences, 01 224 Warszawa, Kasprzaka 44, Poland
2. Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark
3. Istituto di Chimica Quantistica ed Energetica Molecolare del Consiglio Nazionale delle Ricerche, via Risorgimento 35, I-56126 Pisa, Italy