[{"from": "human", "value": "What can you tell me about this molecule? [C][C][=C][CH1-1][C][=C][Ring1][Branch1].[C-1][#O+1].[C-1][#O+1].[C-1][#O+1].[Mn]"}, {"from": "gpt", "value": "The molecule is a chemical compound of manganese. It was initially used as a supplement to the gasoline additive tetraethyl lead to increase a fuel's octane rating,  then later also used in unleaded gasoline. It has been banned in various countries in the past due to its toxicity, but is available in most places today, despite controvery over its safety. Manganese is a naturally occurring metal with the symbol Mn and the atomic number 25. It does not occur naturally in its pure form, but is found in many types of rocks in combination with other substances such as oxygen, sulfur, or chlorine. Manganese occurs naturally in most foods and small amounts are needed to stay healthy, as manganese ions act as cofactors for a number of enzymes. (L228, L229, L239) "}]