1. Department of Biochemisty, Institute of Chemistry; P.J. Šafárik University Košice; Moyzesova 11 Košice Slovak Republic
2. Biomedical Research Center; University Hospital Hradec Kralove; Sokolovska 581 Hradec Kralove Czech Republic
3. Department of Organic Chemistry, Institute of Chemistry; P.J. Šafárik University Košice; Moyzesova 11 Košice Slovak Republic