Hydrogen-bonding patterns in rac-1-acetyl-5-methyl-2-thioxoimidazolidin-4-one

In the title compound, C₆H₈N₂O₂S, also known as N-acetyl-2-thio­hydantoin–alanine, the mol­ecules are joined by N—H...O hydrogen bonds, forming centrosymmetric R₂²(8) dimers; these dimers are linked by C—H...O inter­actions to form R₂²(10) rings, thus forming C₂²(10) chains that run along the [101] direction.