Sodium 1,3-dithiole-2-thione-4,5-dithiolate is the organosulfur compound with the formula Na2C3S5, abbreviated Na2dmit.

It is the sodium salt of the conjugate base of the 4,5-bis(sulfanyl)-1,3-dithiole-2-thione.

The salt is a precursor to dithiolene complexes and tetrathiafulvalenes.

[2] The dianion C3S52- is purified as the tetraethylammonium salt of the zincate complex [Zn(C3S5)2]2-.

This salt converts to the bis(thioester) upon treatment with benzoyl chloride:[3][1] Cleavage of the thioester with sodium methoxide gives sodium 1,3-dithiole-2-thione-4,5-dithiolate: Na2dmit undergoes S-alkylation.