drug isolation article 174 nonhuman 174 unclassified drug 166 drug structure 100 controlled study 84 Animals 54 priority journal 50 proton nuclear magnetic resonance 50 plant extract 46 carbon nuclear magnetic resonance 44 Molecular Structure 38 antiviral activity 38 nuclear magnetic resonance 38 structure analysis 36 human 34 Magnetic Resonance Spectroscopy 30 cytotoxicity 30 Argentina 28 Humans 28 human cell 28 mass spectrometry 28 animal cell 26 in vitro study 26 phytochemistry 26 antifungal activity 24 drug cytotoxicity 24 Antiviral Agents 22 antivirus agent 22 drug identification 22