article drug structure unclassified drug 80 nonhuman 60 drug isolation 48 proton nuclear magnetic resonance 46 carbon nuclear magnetic resonance 36 nuclear magnetic resonance 36 Molecular Structure 34 controlled study 32 Animals 28 priority journal 26 Magnetic Resonance Spectroscopy 18 drug synthesis 18 Nuclear Magnetic Resonance, Biomolecular 16 structure analysis 16 antifungal activity 14 mass spectrometry 14 nuclear magnetic resonance spectroscopy 14 Glycosides 12 Humans 12 antimicrobial activity 12 Antifungal Agents 10 Argentina 10 Holothuroidea 10 Triterpenes 10 antiviral activity 10 heteronuclear multiple bond correlation 10 human 10 human cell 10