3,3-Bis(methyl-sulfan-yl)-1-(4-nitro-phen-yl)prop-2-en-1-one.

In the title compound, C11H11NO3S2, the S-Csp (2) bonds are shorter [1.746 (3) and 1.750 (2) Å] than the S-CH3 bonds [1.

[6-(Furan-2-yl)-7-nitro-2,3,4,6,7,8-hexa-hydro-1H-pyrido[1,2-a]pyrimidin-9-yl](phen-yl)methanone.

The asymmetric unit of the title compound, C19H19N3O4, contains two mol-ecules with very few conformational differences; a C atom in the pyrimidine ring in one of the mol-ecules is disordered in a 0.688 (15):0.312 (15) ratio.

1-(4-Chloro-phen-yl)-2-(1,3-diazepan-2-yl-idene)ethanone.

In the title compound, C13H15ClN2O, there are two crystallographically independent but conformationally similar (E)-mol-ecules in the asymmetric unit [dihedral angles between the phenyl ring and a common planar fragment of the 1,3-diazepane moiety = 47.34 (16) and 48.00 (16)°].

(E)-Benzo-yl[1-(2-hydroxy-ethyl)imidazolidin-2-yl-idene]acetonitrile.

In the title compound, C(14)H(15)N(3)O(2), the C=C(H)-C=O grouping and the imidazolidine ring are coplanar as a result of an intra-molecular N-H⋯O hydrogen bond and extended electronic conjugation. Inter-molecular N-H⋯O and O-H⋯N hydrogen bonds help to establish the packing.