1. Department of Chemistry of Heterocyclic CompoundsThe L.M. Litvinenko Institute of Physical Organic and Coal ChemistryUkrainian Academy of Sciences, 50 Kharkiv road, Kyiv 02160 Ukraine
2. Department of Chemistry of Stable CarbenesThe Institute of Organic ChemistryUkrainian Academy of Sciences; 5 Murmanskaya Street, Kyiv-94 02660
3. Department of ChemistryThe University of Texas at Austin 1 University Station A5300, Austin Texas 78712-0165
4. Life Chemicals Inc. 5 Murmanska Street, Kyiv-94 02660 Ukraine