Plant Bark bark 11 chemistry 10 Molecular Structure 6 isolation and purification 6 plant extract 6 unclassified drug 6 Article 5 chemical structure 5 drug isolation 5 plant stem 5 xanthone derivative 5 Clusiaceae 4 Plant Stems 4 Xanthones 4 carbon nuclear magnetic resonance 4 drug structure 4 heteronuclear multiple bond correlation 4 mass spectrometry 4 nonhuman 4 Antioxidants 3 Humans 3 IC50 3 Magnetic Resonance Spectroscopy 3 Nuclear Magnetic Resonance, Biomolecular 3 Plant Extracts 3 antiinflammatory activity 3 antiinflammatory agent 3 antioxidant 3 article 3