Pyridine-aldoxime is a organic compound that combines a pyridine ring and an aldoxime function (CH=NOH), with the oxime function attached to the cycle, existing in several isomers such as 2-, 3-, or 4-pyridinealdoxime. These molecules are used as analytical reagents for the detection of metals (such as palladium) and as agents for reactivating enzymes inhibited by organophosphors, in particular acetylcholinesterase