data reports IUCrData (2023). 8, x230060 https://doi.org/10.1107/S2414314623000603 1 of 3 3-(2-Bromoethyl)-5,5-diphenylimidazolidine-2,4- dione Walid Guerrab, a Abderrazzak El Moutaouakil Ala Allah, a Abdulsalam Alsubari, b * Joel T. Mague c and Youssef Ramli a a Laboratory of Medicinal Chemistry, Drug Sciences Research Center, Faculty of Medicine and Pharmacy, Mohammed V University in Rabat, Morocco, b Laboratory of Medicinal Chemistry, Faculty of Clinical Pharmacy, 21 September University, Yemen, and c Department of Chemistry, Tulane University, New Orleans, LA 70118, USA. *Correspondence e-mail: alsubaripharmaco@21umas.edu.ye The imidazolidine ring in the title molecule, C 17 H 15 BrN 2 O 2 , is slightly ruffled [r.m.s. deviation = 0.0192 A ˚ ], while the attached phenyl rings at the C atom at the position between the amine and carbonyl centres are rotated well out of its mean plane [dihedral angles with the imidazolidine ring = 63.60 (8) and 76.4 (1)  ]. In the crystal, a three-dimensional network features N—HO and C—HO hydrogen bonds together with C—H(ring) interactions. Structure description Phenytoine (5,5-diphenylimidazolidine-2,4-dione) is a drug widely prescribed as an anticonvulsant agent and for the treatment of many other diseases, including HIV (Weichet, 1974; Havera & Strycker, 1976; Khodair et al., 1997; Thenmozhiyal et al., 2004). Given the wide range of therapeutic applications for such compounds, and in a conti- nuation of our work in this area (Ramli et al., 2017a,b; Akrad et al., 2017; Guerrab et al. , 2019, 2020a,b, 2022a,b), the title compound (Fig. 1) was prepared and its crystal structure determined. The C1/C2/N1/C3/N2 ring is planar to within 0.0254 (13) A ˚ (r.m.s. deviation of the fitted atoms = 0.0192 A ˚ ) with the atoms alternately disposed above and below the mean plane. The C6–C11 and C12–C17 phenyl rings are inclined at 63.60 (8) and 76.4 (1)  , respectively, to the the above plane. In the crystal, inversion dimers are formed by N2— H2O2 hydrogen bonds (Table 1 and Fig. 2) and are connected into layers parallel to (101) by C4—H4AO1 hydrogen bonds (Table 1 and Fig. 2). These layers are joined into a three-dimensional network by C8—H8O1 hydrogen bonds and C10— H10Cg(C12–C17) interactions (Table 1 and Fig. 3). Received 18 January 2023 Accepted 23 January 2023 Edited by E. R. T. Tiekink, Sunway University, Malaysia Keywords: crystal structure; imidazolidene- dione; hydrogen bond; C—H(ring) inter- action. CCDC reference: 2235944 Structural data: full structural data are available from iucrdata.iucr.org ISSN 2414-3146 Published under a CC BY 4.0 licence