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Ethanethiol, commonly known as ethyl mercaptan, is a colourless gas or clear liquid with a distinct odour. It is an organosulphur compound with the formula CH3CH2SH. Organosulphur compounds are organic compounds that contain sulphur. Abbreviated EtSH, it consists of an ethyl group (Et), CH3CH2, attached to a thiol group, SH. Its structure parallels that of ethanol, but with S instead of O. The odour of EtSH is infamous. Ethanethiol is more volatile than ethanol due to a diminished ability to engage in hydrogen bonding. Ethanethiol is toxic. It occurs naturally as a minor component of petroleum, and may be added to otherwise odourless gaseous products such as liquefied petroleum gas (LPG) to help warn of gas leaks. At these concentrations, ethanethiol is not harmful.