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

In the crystal structure of the title compound, C17H15NOS, the mol­ecules form centrosymmetric dimers through pairs of N—H⋯O hydrogen bonds. The seven-membered ring adopts a distorted half-chair conformation

3-Acetyl-4-hydroxy­phenyl acrylate

In the title compound, C12H12O4, the hydr­oxy O and the C and O atoms of the acetyl group are almost coplanar [maximum deviation = 0.0356 (1) Å] with the benzene ring. The dihedral angle between the benzene ring and the plane through the non-H atoms of the methacrylo­yloxy group is 86.1 (1)°. In the crystal structure, mol­ecules are linked by two C—H⋯O hydrogen bonds, forming dimers with graph-set descriptor R 2 2(16). A strong intra­molecular O—H⋯O hydrogen bond is also observed

Methyl 3-(4-fluoro­phen­yl)-1-methyl-1,2,3,3a,4,9b-hexa­hydro­chromeno[4,3-b]pyrrole-3a-carboxyl­ate

In the title compound, C20H20FNO3, the pyrrolidine and benzopyran rings adopt half chair and twisted half chair conformations, respectively. The carboxyl­ate group is almost perpendicular to the pyran ring [89.4 (1)°]

2′-Hy­droxy­methyl-1′-(4-methyl­phen­yl)-2′-nitro-1′,2′,5′,6′,7′,7a′-hexa­hydro­spiro­[indoline-3,3′-pyrrolizin]-2-one

In the title compound, C22H23N3O4, the tolyl ring is almost perpendicular [83.86 (7)°] to the best plane through the eight atoms of the pyrrolizidine ring system. The mol­ecular conformation is stabilized by an intra­molecular O—H⋯O hydrogen bond. The crystal packing features inversion dimers with R 2 2(8) motifs linked by pairs of N—H⋯O hydrogen bonds

Methyl 3-(4-bromo­phen­yl)-2-(1H-indol-3-ylmeth­yl)-5-[1-(4-methoxy­phen­yl)-4-oxo-2-phenyl­azetidin-2-yl]-4-nitro­pyrrolidine-2-carboxyl­ate

In the title compound, C37H33BrN4O6, the pyrrolidine ring adopts an envelope conformation. The β-lactam ring is planar and makes dihedral angles of 70.16 (13) and 28.32 (13)° with the phenyl and 4-methoxy­phenyl rings, respectively. The mol­ecular packing is stabilized by intra­molecular C—H⋯O inter­actions and the crystal packing is determined by inter­molecular N—H⋯O hydrogen bonds, and C—H⋯O and C—H⋯π inter­actions