Oxygen also reacts with changeover metals and form dioxygen complexes with them, such as myoglobin and hemoglobin (oxygen carrying proteins existing while in the blood). Different important organic compounds also have oxygen, such as citric acid glycerol, acetic anhydride and acetamide. The commonest reaction of oxygen is termed as oxidation. https://brooksdnvbk.blogkoo.com/about-oxygen-chamber-stoke-on-trent-55230081