6,6′-Diheptyl-3,3′-bis[(pyridin-3-yl)ethynyl]-5H,5′H-dipyrrolo[1,2-b:1′,2′-g][2,6]naphthyridine-5,5′-dione

The complete molecule of the title compound, C42H42N4O2, is generated by a crystallographic centre of symmetry. The pendant heptyl chains adopt extended conformations and the dihedral angle between the pyrrole and pyridine rings is 8.18 (15)°. In the crystal, the molecules are arranged in columnar stacks propagating in the [010] direction via slipped aromatic π–π stacking interactions.