1,1'-Methylenebis(4-((hydroxyimino)methyl)pyridinium) 2058-89-1 51026-61-0 61444-84-6 MMB 4 N,N'-Monomethylenebis(pyridiniumaldoxime) Pyridinium, 1,1'-methylenebis(4-((hydroxyimino)methyl)-