nuclear magnetic resonance article 178 unclassified drug 102 nonhuman 78 priority journal 74 Magnetic Resonance Spectroscopy 44 chemical structure 44 drug structure 44 Molecular Structure 42 chemistry 38 drug isolation 38 drug synthesis 38 Nuclear Magnetic Resonance, Biomolecular 36 mass spectrometry 30 Argentina 26 Humans 26 human 26 reaction analysis 26 structure analysis 26 synthesis 24 Nuclear magnetic resonance spectroscopy 22 controlled study 22 Molecular Sequence Data 20 nuclear magnetic resonance spectroscopy 20 Support, Non-U.S. Gov't 18 metabolism 18 Crystallography, X-Ray 16 Nuclear magnetic resonance 16 Proteins 16 human cell 16