Experimental

R factor = 0.058; wR factor = 0.173; data-to-parameter ratio = 12.6. In the title compound, C27H22N2O4, the dihedral angles between the central benzene ring and the cyanobenzene ring and the 2H-coumarin ring system (r.m.s. deviation = 0.014 Å) are 22.95 (11) and 75.59 (8), respectively. Both terminal C atoms of the pendant diethylamino group lie to the same side of the coumarin ring system [deviations = 1.366 (2) and 1.266 (2) Å]. In the crystal, molecules are linked by C—H O and C—H N hydrogen bonds and a C—H interaction, generating a three-dimensional network. Related literature For the biological properties of coumarin derivatives, see: Bhat et al. (2006); Chimichi et al. (2002)