title: 6-(4-Bromo-phen-yl)-2-eth-oxy-4-(2,4,5-trimethoxy-phen-yl)nicotinonitrile.
abstract: There are two mol-ecules in the asymmetric unit of the title compound, C(23)H(21)BrN(2)O(4), which differ in the conformation of their ethoxy residues, i.e. almost co-planar with the pyridine ring in one mol-ecule [C-O-C-C = -174.0 (2)°] but almost perpendicular in the other [C-O-C-C = 92.8 (3)°]. The dihedral angles between the central pyridine ring and the 4-bromo-phenyl and 2,4,5-trimethoxy-phenyl rings are 11.05 (12) and 63.78 (12)°, respectively, in one mol-ecule; the corres-ponding angles in the other mol-ecule are 30.38 (13) and 65.38 (13)°, respectively. In the crystal structure, pairs of mol-ecules are arranged in a face-to-face sandwich structure which further stacks along the b axis. The crystal packing features C-H⋯π inter-actions and Br⋯O [3.5417 (17) Å], Br⋯C [3.748 (3) Å], C⋯N [3.376 (4) Å] and C⋯O [3.351 (3)-3.409 (3) Å] contacts. Finally, π⋯π inter-actions [centroid⋯centroid distances = 3.6346 (19) and 3.6882 (19) Å] are observed.
authors.forename: Suchada
authors.initials: S
authors.lastname: Chantrapromma
authors.forename: Hoong-Kun
authors.initials: HK
authors.lastname: Fun
authors.forename: Mahesh
authors.initials: M
authors.lastname: Padaki
authors.forename: Thitipone
authors.initials: T
authors.lastname: Suwunwong
authors.forename: Arun M
authors.initials: AM
authors.lastname: Isloor