1,1'-Methylenebis(4-((hydroxyimino)methyl)pyridinium) dibromide 1,1'-Methylenebis(4-formylpyridinium) dibromide dioxime 2058-89-1 61444-84-6 MMB-4 Pyridinium, 1,1'-methylenebis(4-((hydroxyimino)methyl)-, dibromide Pyridinium, 1,1'-methylenebis(4-formyl-, dibromide, dioxime