Crystal structure and Hirshfeld surface analysis of 4-oxo-3-phenyl-2-sulfanylidene-5-(thiophen-2-yl)-3,4,7,8,9,10-hexahydro-2H-pyrido[1,6-a:2,3-d′]dipyrimidine-6-carbonitrile

In the title compound, C₂₁H₁₅N₅OS₂, molecular pairs are linked by N—H...N hydrogen bonds along the c-axis direction and C—H...S and C—H...O hydrogen bonds along the b-axis direction, with R ² ₂(12) and R ² ₂(16) motifs, respectively, thus forming layers parallel to the (10\overline{4}) plane. In addition, C=S...π and C[triple-bond]N...π interactions between the layers ensure crystal cohesion. The Hirshfeld surface analysis indicates that the major contributions to the crystal packing are H...H (43.0%), C...H/H...C (16.9%), N...H/H...N (11.3%) and S...H/H...S (10.9%) interactions.