Crystal structure and Hirshfeld surface analysis of 6-amino-8-phenyl-1,3,4,8-tetrahydro-2H-pyrido-[1,2-a]pyrimidine-7,9-dicarbonitrile.

In the title compound, C₁₆H₁₅N₅, the 1,4-di­hydro­pyridine ring has a shallow boat conformation, while the 1,3-diazinane ring adopts an envelope conformation. In the crystal, pairwise N—H...N hydrogen bonds generate centrosymmetric dimers featuring R₂²(12) motifs and C—H...N contacts connect these dimers to form double layers lying parallel to (001). Weak C—H...π and N—H...π inter­actions help to consolidate the double layers and van der Waals inter­actions occur between layers. A Hirshfeld surface analysis indicates that the most significant contributions to the crystal packing are from H...H (38.5%), N...H/H...N (33.3%) and C...H/H...C (27.3%) contacts. [ABSTRACT FROM AUTHOR]