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5-Furfural-2-thiohydantoin 5-Furfurylidene-2-thiohydantoin 5-Furfural-2-thioxoimidazolidin-4-one 2-Thioxo-4-furfurylideneimidazolidine-5-one 4-Imidazolidinone, 5-(2-furanylmethylene)-2-thioxo-