1,3-Dioxane-2-methanaminium, N,N'-((1,1'-biphenyl)-4,4'-diylbis(2-oxo-2,1-ethanediyl))bis(N,N-dimethyl-, dibromide 123489-69-0 4,4'-Bis(((1,3-dioxan-2-ylmethyl)methylamino)acetyl)biphenyl dimethiobromide