structure analysis article 288 unclassified drug 194 nonhuman 172 priority journal 134 controlled study 102 chemical structure 86 Animals 82 Humans 68 human 58 drug structure 52 Article 46 reaction analysis 44 Models, Molecular 42 chemistry 40 Molecular Structure 38 carbon nuclear magnetic resonance 38 drug isolation 36 structure activity relation 36 synthesis 36 conference paper 34 molecular dynamics 34 Magnetic Resonance Spectroscopy 32 Molecular Sequence Data 32 metabolism 32 protein conformation 32 proton nuclear magnetic resonance 32 protein structure 30 crystal structure 28 nuclear magnetic resonance spectroscopy 28