In the title compound, C(17)H(18)N(8), the imidazolidine ring adopts an envelope conformation with the substituents at the N atoms in trans positions with respect to the central ring. The dihedral angle between the two benzotriazole rings is 71.65 (10)°. In the crystal, non-classical C-H⋯N inter-actions link the mol-ecules into helical chains along the b axis. The crystal packing is further stabilized by weak C-H⋯π inter-actions.