1-Meth­yl-6,7-dihydro­pyrrolo[2,3-c]azepine-4,8(1H,5H)-dione

The title compound, C₉H₁₀N₂O₂, was synthesized by cyclization of 3-(1-methyl­pyrrole-2-carboxamido)propanoic acid in the presence of phospho­rus oxychloride. Inter­molecular N—H...O hydrogen bonds generate a one-dimensional chain in the crystal structure.

Tetra­kis(3,5-lutidine)dichloro­nickel(II)

In the title compound, [NiCl₂(C₇H₉N)₄], where C₇H₉N is 3,5-lutidine, the Ni^II atom is coordinated by two Cl atoms and four N atoms from 3,5-lutidine groups. The geometry around the Ni^II atom, which is located at a special position of symmetry 422, is octahedral. Mol­ecules of the title compound are connected by C—H...Cl inter­molecular hydrogen bonds and C—H...π inter­actions to form a three-dimensional structure.

Di-μ-chloro-bis­[aqua­(caffeine)chloro­copper(II)]

The title compound, di-μ-chloro-bis­[aqua­chloro­(3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione)copper(II)], [Cu₂Cl₄(C₈H₁₀N₃O₂)₂(H₂O)₂], has the same chemical empirical formula as another compound [Bandoli et al. (1976). Inorg. Chim. Acta, 20, 71–78]. However, the title compound is a dimer arranged around an inversion centre, whereas Bandoli's compound is a chiral polymer. In the title compound, the Cu^II atom has a distorted tetra­gonal pyramidal coordination, formed by three Cl atoms, one N atom of the caffeine ligand and one O atom of a water mol­ecule.

N-(2-Hydroxy­ethyl)-13c-meth­oxy-1-oxo-1,13c-dihydro­dibenzo[a,kl]xanthene-2-carboxamide

The title compound, C₂₄H₁₉NO₅, contains five fused rings, of which three are planar and the other two have twisted and flattened boat forms. The crystal structure is stabilized by intra- and inter­molecular N—H...O, O—H...O and C—H...O hydrogen bonds.