title: (Z)-Methyl 4-({3-[(2,5-dioxoimidazolidin-4-yl-idene)meth-yl]-1H-indol-1-yl}meth-yl)benzoate.
abstract: In the title compound, C(21)H(17)N(3)O(4), pairs of mol-ecules form a planar[maximum deviation 0.0566 (9) Å] centrosymmetric imidazole dimer via two N-H⋯O hydrogen bonds. These dimeric units are linked by further N-H⋯O hydrogen bonds between the ester carbonyl group and the imidazolidine ring, formiing chains parallel to the c-axis direction. In addition, there are π-π stacking inter-actions between the planar imidazole pairs, with an inter-planar spacing of 3.301 (2) Å. There is a double bond with Z geometry connecting the imidazolidine and indole units.
authors.forename: Narsimha Reddy
authors.initials: NR
authors.lastname: Penthala
authors.forename: Thirupathi Reddy Yerram
authors.initials: TR
authors.lastname: Reddy
authors.forename: Sean
authors.initials: S
authors.lastname: Parkin
authors.forename: Peter A
authors.initials: PA
authors.lastname: Crooks