a class of organic compounds that contain a five-membered ring with at least one nitrogen atom and one other heteroatom, such as oxygen or sulfur.
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N-(2-oxo-2-phenylethyl)-7-diethylamino-2-oxo-2H-chromene-3-carboxamide
2-(2,4-Difluorophenyl)-3-(1H-1,2,4-triazol-1-yl)-1,2-propanediol
1-(4-fluorophenyl)-4-(4,5-dihydro-5-thioxo-1,3,4-oxadiazol-2-yl)pyrrolidin-2-one
