In the crystal, enanti­omerically pure (S)-3-(2-meth­oxy­pheno­thia­zin-10-yl)-N,N,2-tri­methyl­propanaminium hydrogen maleate, also known as levomepromazine maleate, forms a three-dimensional supra­molecular network through N—HO, C—HO and C—Hπ inter­actions. The asymmetric unit comprises two slightly conformationally different levomepromazine cations and two hydrogen maleate anions.

The structure-directing effects of four O,O′-donor hy­droxy­pyri­dine­carboxyl­ate derivatives in their com­plexation with Zn^II have been investigated by single-crystal X-ray diffraction. One octahedral and two trigonal bipyramidal mononuclear com­plexes, as well as a pyridino­late-bridged dinuclear complex with octahedral geometry, were detected.

The title compound diethyl 2-acet­oxy-2-[3-(4-nitro­phen­yl)-3-oxo-1-phenyl­prop­yl]malonate possesses a three-dimensional supra­molecular structure formed through weak C—HO and C—Hπ hydrogen bonds.

The crystal structure of diethyl 3-(3-chloro­phen­yl)-2,2-di­cyano­cyclo­propane-1,1-di­carboxyl­ate shows one-dimensional chain substructures linked into two-dimensional layers of mol­ecules, through both C—HO_carbox­yl and C—HN_nitrile hydrogen bonds.