1. Theoretical Chemistry Group, Institute of Physical and Theoretical Chemistry, Wrocław University of Technology, Wybrzeże Wyspiánskiego 27, 50-370 Wrocław, Poland
2. Institute of Organic and Pharmaceutical Chemistry, The National Hellenic Research Foundation, 48 Vas. Constantinou Avenue, 11635 Athens, Greece
3. Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States