1. División de Química Orgánica, Instituto de Bioingeniería Universidad Miguel Hernández Avda. de la Universidad s/n 03203 Elche Spain
2. Department of Chemistry University of North Texas at Denton 1155 Union Circle, #305070 Denton TX 76203-5017 USA
3. Department of Physical Sciences and Mathematics Wayne State College 1111 Main Street Wayne Nebraska 68787 USA