1. Department of Chemistry, Faculty of PharmacyMedical University–Sofia Sofia Bulgaria
2. Institute of Organic Chemistry with Centre of PhytochemistryBulgarian Academy of Sciences Sofia Bulgaria
3. Department of Pharmacy, Faculty of MedicineUniversity of Nis Nis Serbia
4. Center for Biomedicinal Science, Faculty of MedicineUniversity of Nis Nis Serbia
5. Department of Chemistry, Faculty of MedicineUniversity of Nis Nis Serbia