1. Área de Química Orgánica, Instituto de Bioingeniería Universidad Miguel Hernández Avda. de la Universidad s/n 03202 Elche Spain
2. Department of Chemistry University of North Texas 1155 Union Circle, #305070 Denton TX 76203-5017 USA
3. Department of Physical Sciences and Mathematics Wayne State College 111 Main Street Wayne NE 68787 USA