Methanethiol, also known as methyl mercaptan, is a colorless gas with a strong, unpleasant odor similar to that of rotten cabbage. It is a simple organosulfur compound with the chemical formula CH₃SH. Methanethiol is naturally produced by certain bacteria and is found in small amounts in some foods, such as garlic and onions. This compound is primarily used in the production of methionine, an essential amino acid in animal feed. Methanethiol is also utilized in the synthesis of various chemicals and as an odorant for natural gas, helping to detect leaks due to its strong smell.