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In the title mol-ecule, C 21 H 20 N 2 O 3 S, the styryl and ester substituents are displaced to opposite sides of the plane of the pyridine ring. In the crystal, C-H⋯O hydrogen bonds form chains extending parallel to the a- axis direction, which pack with partial inter-calation of the styryl and ester substituents. A Hirshfeld surface analysis indicates that the most significant contributions to the crystal packing are from H⋯H (43.6%), C⋯H/H⋯C (15.6%), O⋯H/H⋯O (14.9%) and N⋯H/H⋯N (11.2%) contacts.

Crystal structure and Hirshfeld surface analysis of ethyl 2-({5-acetyl-3-cyano-6-methyl-4-[(E)-2-phenylethenyl]pyridin-2-yl}sulfanyl)acetate