Abstract: In the molecule of the title compound, C16H14O4, the ester group is oriented with respect to the aromatic rings at dihedral angles of 7.74 (5) and 17.83 (4)°.

Abstract: In the title compound, C19H17O3N4S, a substituted oxadiazole derivative and an important biologically active compound, electron delocalization in the oxadiazole ring is reflected in the C-N bond lengths.