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In the title compound, C 18 H 14 N 2 O 4 , the piperazine ring adopts a chair conformation and the dihedral angle between the aromatic rings is 13.09 (9)°. In the crystal, mol­ecules are linked along the  c  axis by C—H⋯π and N⋯π [H(N)–centroid distances = 2.8030 (2) and 3.376 (2) Å] inter­actions between neighbouring mol­ecules.

3,22-Dioxa-11,14-diazapentacyclo[12.8.0.02,11.05,10.015,20]docosa-5(10),6,8,15(20),16,18-hexaene-4,21-dione

3,22-Dioxa-11,14-diazapentacyclo[12.8.0.0^2,11.0^5,10.0^15,20]docosa-5(10),6,8,15(20),16,18-hexaene-4,21-dione