A functional group with the structure R1-C(=O)-R2, where R1 and R2 can be any organic group.
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3-Cyclohexene-1-carboxaldehyde,oxime,(E)-(9CI)
ETHYL 2-ANILINO-4-OXO-4,5-DIHYDRO-3-THIOPHENECARBOXYLATE
OsNCH3(CH2Si(CH3)3)3Cl