Sesquimustard

Sesquimustard is the organosulfur compound with the formula. Although it is a colorless solid, impure samples are often brown. The compound is a type of mustard gas, a vesicant used as a chemical weapon. From the chemical perspective, the compound is both a thioether and an alkyl chloride.
Because sesquimustard is a solid at room temperature, it is not as easily deployed as related liquid mustards. It was only ever deployed as mixtures with the original mustard, with phosgene, or as a solution. Since 1997, it has been listed under List of [Schedule 1 substances (CWC)|Schedule I] of the Chemical Weapons Convention, as a substance with few uses outside of chemical warfare.