This is a functional group that contains two acyl groups attached to an oxygen atom.
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diacetyl-formyl-amine
Propanethioic acid, 2,2-dimethyl-, S-cyclohexyl ester
(3,5-bis(trifluoromethyl)phenyl)sulfamoyl chloride
2-Anilino-2H-isoindole-1,3-dione