The title compound, C19H18N2O2, crystallizes with two independent molecules in the asymmetric unit which differ in conformation. The seven-membered ring adopts a `bowl' conformation with the benzyl group oriented away from the open face in one molecule, while the benzyl group is oriented towards the open face in the other. The benzyl group of one independent molecule is disordered over two sets of sites with refined site-occupancy factors of 0.454 (8) and 0.546 (8). The two molecules are linkedviaC—H...O hydrogen bonds and centrosymmetrically related pairs of molecules form dimers through C—H...O hydrogen bonds, packing in rows parallel to thecaxis.
In the title molecule, C19H18N2O2, the orientation of the oxopropylidene substituent is largely determined by an intramolecular N—H...O hydrogen bond. In the crystal, C—H...O hydrogen bonds form zigzag chains, which are elaborated into sheets lying parallel to (101) by complementary C—H...π interactions. Comparisons to the structure of the triclinic modification are made.
The title compound is built up from the benzodiazepine ring system linked to the pyridyl and pendant dihydropyran rings. In the crystal, N—H⋯O and C—H⋯O hydrogen bonds link the molecules into a three-dimensional network. A weak C—H ⋯ π interaction is also observed.
The conformation of the title compound, C18H18N4O, is partly determined by an intramolecular N—H...O hydrogen bond that imposes planarity on the central aminoethylidene-3-methylpyrazol-5-one segment of the molecule. In the crystal, N—H...O hydrogen and N—H...N hydrogen bonds both form centrosymmetric dimers that encloseR22(18) rings. These, together with C—H...N and π–π stacking interactions between centrosymmetrically related pyrazalone rings, stack the molecules along theb-axis direction.
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