1,1'-(4,4'-Biphenylenebis(2-oxoethylene))bis(4-methylpyridinium) dibromide 19035-84-8 4-Picolinium, 1,1'-(4,4'-biphenylylenebis(2-oxoethylene))di-, dibromide Pyridinium, 1,1'-(4,4'-biphenylenebis(2-oxoethylene))bis(4-methyl-, dibromide