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In the title compound, C 18 H 16 N 4 O 2 , the dihedral angle between the fused tricyclic ring system and the pendant benzene ring is 11.03 (4)°. The C—O—C—C torsion angle in the ethyl ester is 102.97 (12)°. The molecular conformation is supported by intramolecular C—H...N and C—H...O hydrogen bonds, which close  S (6) and  S (7) rings, respectively. Aromatic π–π stacking is observed in the crystal [shortest centroid–centroid separation = 3.5274 (7) Å].

Ethyl 5-(4-methylphenyl)-2,4,5,7-tetraazatricyclo[6.4.0.02,6]dodeca-1(8),3,6,9,11-pentaene-3-carboxylate

Ethyl 5-(4-methylphenyl)-2,4,5,7-tetraazatricyclo[6.4.0.0^2,6]dodeca-1(8),3,6,9,11-pentaene-3-carboxylate