Abstract
The molecule of the title compound, C10H11N3O, is planar, including the ethyl group, as indicated by the N-C-C-C torsion angle of 1.5 (2)degrees. In the crystal, inversion-related molecules are stacked along the a axis. Molecules are oriented head-to-tail and display pi-pi interactions with a centroid-to-centroid distance of 3.6664 (8) angstrom. N-H center dot center dot center dot O hydrogen bonds between molecules generate a 'step' structure through formation of an R-2(2)(10) ring.