In the title orthorhombic polymorph (space group Iba2). C17H13N. the dihedral angle between the benzene rings is 55. 99 (10)° and the azepine ring adopts a boat conformation. https://www.bekindtopets.com/hot-sale-Osborne-RN3-Big-Wheel-Nursery-Hog-Feeder-best-save/