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　(C40H46N6O4)　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:　M-r　=　674.83,　triclinic,　P(1)　over　bar,　a　=　5.8249(1),　b　9.4114(8),　c　=　17.649(2)　Angstrom,　alpha　=　79.310(7),　beta　=　5.397(4),　gamma　=　78.970(8)degrees,　V　=　932.1(1)　Angstrom(3),　Z　=　1,　D-c　=　1.202　g/cm(3),　F(000)　=　360,　mu(MoKalpha)　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)　Angstrom.