In chemistry, an amine oxide, also known as an amine N-oxide or simply N-oxide, is a chemical compound that contains the functional group R3N+−O−, a nitrogen-oxygen coordinate covalent bond with three additional hydrogen and/or substituent-group side chains attached to N. Sometimes it is written as R3N→O or, alternatively, as R3N=O. In the strict sense, the term amine oxide applies only to oxides of tertiary amines. Wikipedia