2,4-Dithiapentane is an organosulfur compound, and is the simplest alkyl dithioether.

It is a colorless liquid with a strong odor, reminiscent of freshly prepared mustard in the pure form.

[1][2] It is industrially prepared by the acid-catalyzed condensation of methyl mercaptan, the main aromatic compound in both halitosis and foot odor and a secondary compound in flatulence,[3] with formaldehyde.

2,4-Dithiapentane is found as an aromatic component in some truffle varieties.

[9] It has also been found to occur naturally in rotting wood of some species in the genus Lecythis.