drug structure unclassified drug 8 nonhuman 7 phytochemistry 7 plant extract 5 Article 4 bark 4 drug isolation 4 IC50 3 antibacterial activity 3 antidiabetic activity 3 antiinflammatory activity 3 antioxidant activity 3 controlled study 3 enzyme activity 3 flavonoid 3 heteronuclear multiple bond correlation 3 human 3 plant leaf 3 priority journal 3 traditional medicine 3 Acetylcholinesterase 2 Plant Extracts 2 Review 2 antihypertensive activity 2 antiinflammatory agent 2 antiproliferative activity 2 betulin 2 carbon nuclear magnetic resonance 2 chemistry 2