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any of a class of chemical compounds formed by reactions of ozone (q.v.) with other compounds. Organic ozonides, often made from olefins (q.v.), are unstable, most of them decomposing rapidly into oxygen compounds, such as aldehydes, ketones, and peroxides, or reacting rapidly with oxidizing or reducing agents. A few inorganic ozonides are known, containing the negatively charged ion O-3; an example is potassium ozonide (KO3), an unstable, orange-red solid formed from potassium hydroxide and ozone that, upon heating, decomposes into oxygen and potassium superoxide (KO2).