1 Department of Pharmacognosy, Faculty of Pharmacy, Gazi University, Etiler, 06330 Ankara, Turkey.
2 Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Faculty of Science, James Parsons Building, Byrom Street, Liverpool L3 3AF, UK.
3 Chemistry Department, Faculty of Science, Universiti Teknologi Malaysia, Johor, Malaysia.