1. Institute of Pharmaceutical Chemistry; University of Szeged; H-6720 Szeged Eötvös u. 6 Hungary
2. MTA-SZTE Stereochemistry Research Group; Hungarian Academy of Sciences; H-6720 Szeged Eötvös u. 6 Hungary
3. Department of Chemistry; University of Jyväskylä; FIN-40014 Jyväskylä Finland
4. Departamento de Química Orgánica, Facultad de Farmàcia; Universidad de Valencia; Av. Vicente Andrés Estellés, s/n 46100 Valencia Spain