The six-membered ring in the title compound, C13H11NO3, adopts a twist conf
ormation and the lactone ring a planar conformation. The aryl group occupie
s a pseudo-axial position and is orthogonal to the plane through the pyrido
ne ring. The molecules are linked by an intermolecular hydrogen bond betwee
n the N atom and the carbonyl-O atom of a neighbouring molecule [N1 ... O5(
x, y-1, z) = 2.820(5) Angstrom].