Molecular Structure 38 Structure-Activity Relationship unclassified drug article 28 nonhuman 28 controlled study 26 Animals 22 drug synthesis 22 Dose-Response Relationship, Drug 20 chemical structure 18 structure activity relation 18 chemistry 14 drug structure 14 human 14 Humans 12 dose response 12 drug screening 12 Drug Design 10 Parasitic Sensitivity Tests 10 Trypanosoma cruzi 10 animal 10 drug design 10 synthesis 10 Article 8 Cell Proliferation 8 Chagas disease 8 Steroids 8 animal cell 8 drug effects 8 human cell 8