Crystal structure of diethyl 2-amino-6-[(thio­phen-3-yl)ethyn­yl]azulene-1,3-di­carboxyl­ate

The title compound, C(22)H(19)NO(4)S, has an almost planar geometry supported by intra­molecular N—H⋯O and C—H⋯O hydrogen bonds. The thio­phene ring is inclined to the azulene ring by 4.85 (16)°, while the eth­oxy­carbonyl groups are inclined to the azulene ring by 7.0 (2) and 5.7 (2)°. In the crystal, mol­ecules are linked by pairs of N—H⋯O hydrogen bonds, forming inversion dimers with an R (2) (2)(12) ring motif. The dimers are linked via C—H⋯π inter­actions, forming sheets parallel to (10-1).