unindexed drug nonhuman 66 unclassified drug 60 human 40 Humans 34 review 34 Animals 30 drug structure 28 drug synthesis 24 controlled study 22 priority journal 22 article 20 drug targeting 20 drug screening 16 drug design 14 drug isolation 14 structure activity relation 14 Trypanosoma cruzi 12 animal 12 antiviral activity 12 clinical trial 12 drug mechanism 12 phytochemistry 12 plant extract 12 Antiprotozoal Agents 10 Chagas disease 10 Drug Design 10 Structure-Activity Relationship 10 Toxoplasma gondii 10 flavonoid 10