2,4-MEDP 2-Formyl-4'-methyl-1,1'-(oxydimethylene)dipyridinium, dichloride oxime 70441-85-9 Pyridinium, 2-((hydroxyimino)methyl)-1-(((4-methylpyridinio)methoxy)methyl)-, dichloride Pyridinium, 2-formyl-4'-methyl-1,1'-(oxydimethylene)di-, dichloride, oxime