title: Crystal structure of ethyl 2-amino-4-(4-meth-oxy-phen-yl)-4H-1-benzothieno[3,2-b]pyran-3-carboxyl-ate.
abstract: The mol-ecule of the title compound, C21H19NO4S, features a fused ring system whereby a five-membered ring is flanked by two six-membered rings. This is linked to an ethyl 3-carboxyl-ate group and to a meth-oxy-benzene group. The fused-ring system is quasi-planar, with the greatest deviation from the mean plane being 0.131 (1) Å for the methine C atom. The plane through the meth-oxy-benzene ring is nearly perpendicular to that through the fused-ring system, as indicated by the dihedral angle of 85.72 (6)°. An intra-molecular N-H⋯O hydrogen bond is noted. In the crystal, mol-ecules are linked by N-H⋯O hydrogen bonds, forming layers that stack along the a axis.
authors.affiliation: Département de Chimie, Faculté des Sciences, Dhar Mehraz, BP 1796 Atlas, 30000 Fes, Morocco.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Bakhouch
authors.affiliation: Département de Chimie, Faculté des Sciences, Dhar Mehraz, BP 1796 Atlas, 30000 Fes, Morocco.
authors.forename: Abdelali
authors.initials: A
authors.lastname: Kerbal
authors.affiliation: Département de Chimie, Faculté des Sciences, Dhar Mehraz, BP 1796 Atlas, 30000 Fes, Morocco.
authors.forename: Mohamed
authors.initials: M
authors.lastname: El Yazidi
authors.affiliation: Laboratoire de Chimie du Solide Appliquée, Faculté des Sciences, Université Mohammed V, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Saadi
authors.affiliation: Laboratoire de Chimie du Solide Appliquée, Faculté des Sciences, Université Mohammed V, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.
authors.forename: Lahcen
authors.initials: L
authors.lastname: El Ammari
keywords: crystal structure; hydrogen bonding; thio­aurones