1. Institute for General and Analytical Chemistry of the Budapest University of Technology and Economics, Szent Gellért tér 4, 1111 Budapest, Hungary, Fax: (internat.) +36‐1‐463‐3408
2. Maria Curie‐Sklodowska University, Department of Organic Chemistry, Lublin, Poland, Fax: (internat.) +48‐81‐524‐2251
3. Polish Academy of Sciences, Institute of Organic Chemistry, ul. Kasprzaka 44/52, 01‐224 Warsaw, Poland, Fax: (internat.) +48‐22‐632 6681
4. Hannover University, Institute of Organic Chemistry, Schneiderberg 1B, 30167 Hannover, Germany, Fax: (internat.) +49‐511‐762‐4616