title: 1-Acetyl-4-(phenyl-sulfan-yl)imidazolidin-2-one.
abstract: The five-membered ring in the title imidazolidinone derivative, C(11)H(12)N(2)O(2)S, adopts an envelope conformation with the S-bound C atom being the flap atom. Overall, the mol-ecule has a U-shaped conformation as both rings are folded towards each other [dihedral angle = 31.66 (6)°]. An eight-membered amide {⋯HNCO}(2) synthon leads to hydrogen-bonded dimeric aggregates in the crystal: these are additionally linked by C-H⋯π inter-actions.
authors.forename: Alaa A-M
authors.initials: AA
authors.lastname: Abdel-Aziz
authors.forename: Adel S
authors.initials: AS
authors.lastname: El-Azab
authors.forename: Amer M
authors.initials: AM
authors.lastname: Alanazi
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng
authors.forename: Edward R T
authors.initials: ER
authors.lastname: Tiekink