drug structure article 296 unclassified drug 296 nonhuman 242 controlled study 164 drug synthesis 148 Animals 140 priority journal 118 human 112 Humans 106 drug isolation 100 Molecular Structure 72 human cell 72 proton nuclear magnetic resonance 58 in vitro study 56 structure activity relation 56 animal cell 54 antiviral activity 54 structure analysis 52 Trypanosoma cruzi 48 drug mechanism 48 Structure-Activity Relationship 44 chemistry 44 nuclear magnetic resonance 44 Cercopithecus aethiops 42 carbon nuclear magnetic resonance 42 drug screening 42 antivirus agent 40 animal 38 Article 36