1. NMR Spectroscopy Laboratory,
Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, P.O. Box 17, H-1525
Budapest, Pusztaszeri út 59-67, Hungary
2. Department of Physical Chemistry
and Materials Science, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
3. Laboratoire Interdisciplinaire
de Physique CNRS UMR5588, Université J. Fourier de Grenoble, B.P.87, 38402 St Martin d’Hères
cedex, France