A functional group consisting of a carbon atom double-bonded to an oxygen atom, present in amides and lactams.
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N-benzyl-4,5-diphenyl-cis-1,2,3,6-tetrahydrophthalimide
Methyl 1-ethylpyrrolidine-2-carboxylate
Benzenepropanoic acid, b-oxo-a-(triphenylphosphoranylidene)-, 1,1-dimethylethyl ester
d-camphorquinone
3-(3,5-dimethylphenyl)quinoline
1-(3-hydroxy-cyclohexyl)-ethanone
2-bromo-1-phenyl-2-buten-1-one