1-(Ethylsulfanyl)ethanethiol is a volatile organosulfur compound with the molecular formula C4H10S2. It belongs to the class of dithioethers and thiols, featuring both a thioether linkage and a thiol functional group. This compound is known to occur in certain food matrices, particularly in fermented or sulfur-rich vegetables, where it contributes to characteristic pungent or savory aromas. Its structure consists of an ethyl group attached via sulfur to a carbon that also bears a thiol group and a methyl substituent. Due to the presence of sulfur atoms, it exhibits strong odor properties even at low concentrations. Limited peer-reviewed data exists on its physical constants, but as a small-molecule thiol derivative, it is expected to be lipophilic and volatile, making it relevant in flavor chemistry and food science applications.