column chromatography unclassified drug 6 Article 4 nonhuman 3 plant extract 3 proton nuclear magnetic resonance 3 structure activity relation 3 thin layer chromatography 3 Molecular Structure 2 Prismatomeris glabra 2 Rubiaceae 2 article 2 carbon nuclear magnetic resonance 2 chemical structure 2 cytotoxicity 2 flavonoid 2 fractionation 2 hexane 2 human 2 mass spectrometry 2 medicinal plant 2 phytochemistry 2 plant root 2 1 hydroxy 3 methoxy 2 (methoxymethyl) 9,10 anthraquinone 1 1,3 dihydroxy 2 methoxymethyl 9,10 anthraquinone 1 1,3 dimethoxy 2 methyl 9,10 anthraquione 1 1,7-Diarylheptanoids 1 2 bromo 6 ethenylphenol 1 2 hydroxy 5 iodobenzaldehyde 1 2 hydroxy 6 (10' heptadecenyl)benzoic acid 1