The　title　compound　1,4,23,26,29,48-hexaaza-6,9:16,19:31,34:41,44-tetrabenzo-12,15,37,　40-tetraoxa-cyclodotetracontane-4,5,18,19,25,26,39,40-octaene　1　(C　40H46N6O4)　was　synthesized　by　[2+2]　condensation　of　diethylenetriamine　with　4,4′-diformyl-diphenoxyethane　(dialdehyde)　in　a　mixed　solvent　of　ethanol　and　tetrahydrofuran.　The　crystal　data　are:　Mr　=　674.83,　triclinic,　P1̄,　a　=　5.8249(1),　b　=　9.4114(8),　c　=　17.649(2)　Å,　α　=　79.310(7),　β　=　85.397(4),　γ　=　78.970(8)°,　V　=　932.1(1)　Å3,　Z　=　1,　D　c　=　1.202　g/cm3,　F(000)　=　360,　μ(MoKα)　=　0.079　mm-1,　R　=　0.0486　and　wR　=　0.1439.　The　title　molecule　has　a　crystallographic　center　symmetry.　The　distance　between　the　two　secondary　amine　nitrogen　atoms　is　18.890(3)　Å.