1-Methyl-1,2,5,6-tetrahydropyridine-3-carboxaldehyde-O-2-butenyloxime hydrochloride 139886-26-3 3-Pyridinecarboxaldehyde, 1,2,5,6-tetrahydro-1-methyl-, O-2-butenyloxime, monohydrochloride, (E,E)-