The previous crystallographic studies [Wang et al. (2005 ▶). Huaxue Yanjiu 16, 29–32; Wang et al. (2007 ▶). Youji Huaxue, 27, 524] of the title compound, C12H14N2O3, gave only the unit-cell dimensions and an R factor with no other details available: the full structure is presented here. The ethoxy group is disordered over two orientations with refined occupancies of 0.642 (15):0.358 (15). The nine C atoms and two N atoms of the 1-phenyl-2-(propan-2-ylidene)hydrazine segment of the molecule are close to being coplanar, with a maximum deviation of 0.0779 (14) Å for the phenylamino N atom and an intramolecular N—H⋯O hydrogen bond generates an S(6) ring. In the crystal, pairs of C—H⋯O hydrogen bonds link molecules into inverson dimers, generating R 2 2(16) loops
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