trans-4,5-Dihydroxyimidazolidine-2-thione.

In the title compound, C3H6N2O2S, the five-membered ring has an envelope conformation and the two hydroxyl groups lie on opposite sides of the ring. The crystal structure is stablized by intermolecular O—H...S and N—-H...O hydrogen bonds, and also a close O...O intermolecular approach, to form a two-dimensional network parallel to bc. [ABSTRACT FROM AUTHOR]