[{"from": "human", "value": "Provide a brief overview of this molecule. [O][=V][O][V][=O]"}, {"from": "gpt", "value": "The molecule is an oxide of vanadium that occurs naturally as the mineral karelianite. It is used as a catalyst when making ethanol from ethylene. Vanadium is a transition metal with the chemical symbol V and atomic number 23. The element usually combines with other elements such as oxygen, sodium, sulfur, or chloride, and occurs naturally in about 65 different minerals and in fossil fuel deposits. Vanadium is found in many organisms, and is used by some life forms as an active center of enzymes. (L837, L838, L845)"}]