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Poly[(3-oxoisobenzofuranyl-1(3H)-ylidene)carbonyl(3-oxoisobenzofuranyl-1(3H)-ylidene)nitrilo-1,3-phenyleneoxy-1,3-phenyleneoxy-1,3-phenylenenitrilo],a-[(3-ethynylphenyl)imino]-w-[[[1-[(3-ethynylphenyl related products: