Crystal structure of ethyl 2-amino-4-(4-chloro­phen­yl)-4H-1-benzothieno[3,2-b]pyran-3-carboxyl­ate

The title compound, C(20)H(16)ClNO(3)S, is built up from three fused rings, one five- and two six-membered rings, linked to a 3-eth­oxy­carbonyl group and to a 4-chloro­phenyl ring. The hydropyran ring has a flattened envelope conformation, with the C atom substituted by the 4-chloro­phenyl ring as the flap (displaced by 0.077 (2) Å from the plane through the other atoms). The fused three-ring system is quasi-planar (r.m.s. deviation = 0.057 Å), with the largest deviation from the mean plane being 0.106 (1) Å for the C atom substituted by the 4-chloro­phenyl ring. The 4-chloro­phenyl ring is approximately perpendicular to the mean plane of the fused ring system, as indicated by the dihedral angle of 77.32 (6)° between their mean planes. There is an intra­molecular N—H⋯O hydrogen bond forming an S(6) ring motif. 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. There are also short inter­molecular Cl⋯O inter­actions present [3.1226 (12) Å] between neighbouring mol­ecules.