The phenytoin-derived compound 2-(2,5-dioxo-4,4-diphenylimidazolidin-1-yl)-N-(4-methoxyphenyl)acetamide referred to as Cpd3, investigated in this paper, was studied using D. Functional Theory (DFT) with the B3LYP method and 6-311++G(d,p) basis set, and its theor. structure was validated against the exptl. one.Frontier MOs (FMOs) anal. determined the energy gap between LUMO and HOMO, while a Mol. Electrostatic Potential (MEP) map identified nucleophilic and electrophilic regions.Hirshfeld Surface (HS) anal. examined intermol. interactions.Then Mol. docking revealed strong binding affinities for α-glucosidase and α-amylase, with binding energies of -7.2 and -7.8 kcal/mol, resp.These interactions were stabilized by various bonds, including hydrogen bonds and aromatic interactions.In vitro, the newly synthesized compound was evaluated for its antidiabetic activity against α-glucosidase and α-amylase enzymes and for antioxidant activity by utilizing several tests as DPPH (1, 1-diphenyl-2-picryl hydrazyl), ABTS (2, 2'-azino-bis(3-Et benzthiazoline-6-sulfonicacid)) and reducing power test (FRAP).Hydrolase enzyme inhibition assays showed potent inhibitory effects, with an IC50 of 43.58 ± 1.02μM for α-glucosidase and 108.28 ± 1.20μM for α-amylase, comparable to the standard drug approved Acarbose.These findings suggest Cpd3 as a promising candidate for antihyperglycemic therapy.