68400-13-5 Pyridinium, 4-ethenyl-1-methyl-, iodide, polymer with 1,3-diethenylbenzene, 1,4-diethenylbenzene, 1-ethenyl-3-ethylbenzene and 1-ethenyl-4-ethylbenzene p-Divinylbenzene, m-divinylbenzene, p-ethylvinylbenzene, m-ethylvinylbenzene, N-methyl-4-vinylpyridinium iodide copolymer