Abstract

In the title compound, C12H12N2O2, the seven-membered ring adopts a boat conformation. The orientation of the acetyl substituent on this ring is partly determined by an intramolecular N—H...O hydrogen bond. In the crystal, wrinkled sheets stacked along the a-axis direction are formed by pairwise N—H...O and C—H...O hydrogen bonds. The sheets are connected through additional N—H...O and C—H...O hydrogen bonds stacking the molecules along the a-axis direction. The structure was refined as a three-component twin.

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