Abstract
All interatomic distances in the title compound, C19H21N3O2, are normal. The heterocycle of the quinoxalinone system exhibits a half-chair conformation. The value of the total puckering amplitude QT is 0.391 (5) Å. The benzylaminomethyl part of the side branch is close to planar. This weighted-least-squares plane makes a dihedral angle of 67.45 (14)° with the quinoxalinone plane. In the structure, there are C—H⋯N and C—H⋯O intramolecular hydrogen bonds. The molecules are held together by N—H⋯O intramolecular hydrogen bonds, resulting in a dimeric structure. The dimers are linked by weak C—H⋯O intermolecular hydrogen bonds, resulting in a three-dimensional layered hydrogen-bonded network.
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