4,4-MEDP 4-Formyl-4'-methyl-1,1'-(oxydimethylene)dipyridinium, dichloride oxime 70441-82-6 Pyridinium, 4-((hydroxyimino)methyl)-1-(((4-methylpyridinio)methoxy)methyl)-, dichloride Pyridinium, 4-formyl-4'-methyl-1,1'-(oxydimethylene)di-, dichloride, oxime