Diethyl 3-amino-6-methyl-4-[(E)-2-phenylethenyl]thieno[2,3-b]pyridine-2,5-dicarboxylate

In the title molecule, C22H22N2O4S, the bicyclic core is slightly folded [1.9 (1)°], while pairwise intermolecular N—H...O hydrogen bonding forms dimers across centers of symmetry. The dihedral angle between the phenyl ring an the six-membered ring of the bicyclic core is 75.50 (4)°. The molecular conformation is stabilized by an intramolecular N—H...O hydrogen bond with graph-set motif S(6) and by a weak C—H...O contact, forming an S(7) motif. In the crystal, π–π interactions [centroid-to-centroid distance = 3.7484 (10) Å] between phenyl rings and two weak C—H...π interactions are also observed