4-(Pyrimidin-2-yl)-1-thia-4-azaspiro[4.5]decan-3-one

The title compound, C12H15N3OS, features an envelope conformation for the 1,3-thiazolidin-4-one ring with the S atom as the flap atom. The pyrimidine ring is almost orthogonal to the 1,3-thiazolidin-4-one ring as indicated by the N—C—C—N torsion angle of −111.96 (18)°. Supramolecular dimers are formed in the crystal structure through the agency of C—H...O contacts occurring between centrosymmetrically related molecules. These are linked into supramolecular tapes along [100] via C—H...S contacts.