(Z)-3-(3,4-Dimeth­oxy­benzyl­idene)-2,3-dihydro-1,5-benzothia­zepin-4(5H)-one

In the title compound, C(18)H(17)NO(3)S, the seven-membered thia­zepine ring adopts a slightly distorted sofa conformation. The dihedral angle between the mean plane of the benzothia­zepine ring system and the benzene ring is 5.9 (1)°. The mol­ecular conformation is stabilized by an intra­molecular C—H⋯S hydrogen bond, which generates an S(7) ring motif. In the crystal, N—H⋯O and C—H⋯O hydrogen bonds link inversion-related mol­ecules into dimers, incorporating R (1) (2)(6) and R (2) (2)(8) ring motifs; the acceptor O atom is bifurcated. These dimers are further linked by C—H⋯O hydrogen bonds, forming supra­molecular tapes running along the a axis. These are connected into the three-dimensional architecture by C—H⋯π inter­actions.