A novel binucleating 24-membered macrocyclic ligand, 6,20-bis(2-hydroxy­ethyl)-3,6,9,17,20,23-hex­aza­tri­cyclo­[23.3.1.1^11,15]triaconta-1(29),11(30),12,14,25,27-hexaene (L), was synthesized and crystallized as the tetra­hydro­bromide salt, i.e. 6,20-bis(2-hydroxy­ethyl)-6,20-di­aza-3,9,17,23-hexa­azoniatri­cyclo­[23.3.1.1^11,15]­triaconta-1(29),11(30),­12,14,25,27-hexaene tetrabromide tetrahydrate, C₂₈H₅₀N₆O₂⁴⁺·­4Br^-·4H₂O. A crystallographic inversion center is located in the macrocyclic cavity and the two hydroxy­ethyl pendants are on opposite sides of the macrocyclic plane. The benzene rings of the macrocycle are parallel to each other and a --stacking interaction exists between the benzene rings of adjacent macrocycles, which are separated by 3.791 (9) Å. An infinite intermolecular hydrogen-bond network stabilizes the crystal.