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The structure of the title compound, C17H16N2O3S, was prepared by the reaction of chromone-3-carboxaldehyde with 2-thioxo-imidazolidine-4-one and ethyl iodide. The five-membered imidazolidine ring is in a planar conformation with a maximum deviation of 0.013(1)A, and making a dihedral angle of 5.36(5)° with the benzopyran ring system. The crystal structure is stabilized by intra and intermolecular hydrogen-bond interactions.

Synthesis and Crystal Structure of 3-Ethyl-2-(ethylthio)-5-(4-oxo-4H-chromen-3-yl methylene)imidazolidine-4-one