Synthesis and crystal structure of 2-amino-4-(3-isobutyl-1-phenyl-1H-pyrazol-4-yl)-7,7-dimethyl-5-oxo-5,6,7,8-tetra­hydro-4H-chromene-3-carbo­nitrile

The title com­pound, C₂₅H₂₈N₄O₂, crystallizes in space group P1 with Z = 4. The two independent mol­ecules are related by the approximate translation (x + 1, y + 1, z), but differ in the orientation of the phenyl substituent. Crystals are non-merohedrally twinned by a 180° rotation about c*. In the modified chromene ring systems, the two formal double bonds are the shortest C—C bonds. The oxo ring displays a flattened boat conformation, whereas the other ring is approximately a flattened envelope, with the CMe₂ C atom out of the plane. The mol­ecules are connected by classical N—H⋯N_pyrazole hy­dro­gen bonds to form a ribbon of alternating independent mol­ecules parallel to [110]. The ribbons are joined by weak C_pyrazole—H⋯N_nitrile hy­dro­gen bonds to form a layer structure parallel to the ab plane in the region z ≃ 3/4.