3,16 dioxo lup 20(29) en 30 al 4 Acetylcholinesterase 4 Animals 4 Butyrylcholinesterase 4 Cholinesterase Inhibitors 4 Cholinesterase inhibitors 4 Dose-Response Relationship, Drug 4 Lupane derivatives 4 Molecular modeling 4 Structure-Activity Relationship 4 Triterpenes 4 Triterpenoids 4 acetylcholinesterase 4 animal 4 calenduladiol 4 chemical structure 4 chemistry 4 cholinesterase 4 cholinesterase inhibitor 4 dose response 4 drug synthesis 4 lupane 4 metabolism 4 molecular docking 4 molecular model 4 nonhuman 4 structure activity relation 4 synthesis 4 triterpene 4 unclassified drug 4