1. Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Sumatera Utara, Medan 20222, North Sumatera, Indonesia.
2. Department of Pharmacology, Faculty of Pharmacy, University of Sumatera Utara, Medan 20222, North Sumatera, Indonesia.
3. Department of Pharmaceutical Botany, Faculty of Pharmacy, University of Sumatera Utara, Medan 20222, North Sumatera, Indonesia.