1-Hydroxy-1,2,5,6-tetrahydropyridine-3-carboxaldehyde-O-2-propynyloxime hydrochloride 145427-95-8 3-Pyridinecarboxaldehyde, 1,2,5,6-tetrahydro-1-hydroxy-, O-2-propynyloxime, monohydrochloride, (E)-