1,3-Bis(2-acryloyliminomethylene)-2-oxo-1,3-imidazolidine 19415-92-0 2-Propenamide, N,N'-((2-oxo-1,3-imidazolidinediyl)bis(methylene))bis- N,N'-((2-Oxo-1,3-imidazolidinediyl)bis(methylene))bis-2-propenamide