acetyl group (thing)

A CH₃CO- group on a larger molecule, where the -CH₃ (a methyl group) is single-bonded to the carbon, an oxygen is single-bonded to the carbon, and the carbon has two other bonds to the rest of the molecule.

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From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.