1-[4-(3-{[5-(4-Chloro-phen-yl)furan-2-yl]methyl-idene-amino}-2,5-dioxoimidazol-idin-1-yl)but-yl]-4-methyl-piperazine-1,4-diium dichloride hemihydrate.

The title compound, C(23)H(30)ClN(5)O(3) (2+)·2Cl(-)·0.5H(2)O, was synthesized by N-alkyl-ation of 1-({[5-(4-chloro-phen-yl)-2-furan-yl]methyl-ene}amino)-2,4-imidazolidinedione with 1-bromo-4-chloro-butane, and N-methyl-piperazine. In the crystal, the cations, anions and water mol-ecules are linked by O-H⋯Cl and N-H⋯Cl hydrogen bonds.

2-(Thio-phen-2-yl)ethyl 4-methyl-benzene-sulfonate.

In the title mol-ecule, C(13)H(14)O(3)S(2), the thio-phene and benzene rings form a dihedral angle of 13.86 (13)°. In the crystal, weak inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into layers parallel to the ab plane.

2'-Carb-oxy-meth-oxy-4,4'-bis-(3-methyl-but-2-en-yloxy)chalcone.

In the title compound, C(27)H(30)O(6), also known as sofalcone, an anti-ulcer agent used for the protection of gastric mucosa-, the two benzene rings form a dihedral angle of 6.78 (11)°. Inter-molecular O-H⋯O hydrogen bonds link the mol-ecules into centrosymmetric dimers, which are further linked by weak C-H⋯O inter-actions into ribbons propagated in [2[Formula: see text]0]. Finally, π-π inter-actions between the benzene rings [centroid-centroid distance = 3.583 (13) Å] stabilize the crystal packing.

Methyl 5-chloro-2-nitro-benzoate.

In the title compound, C(8)H(6)ClNO(4), the nitro and acet-oxy groups attached to the benzene ring at neighbouring positions are twisted from its plane by 29.4 (1) and 49.7 (1)°, respectively. In the crystal, weak C-H⋯O hydrogen bonds link mol-ecules into layers parallel to (101). The crystal packing exhibits short inter-molecular C⋯O distances of 2.925 (3) Å.

(R)-[1-(2-Chloro-phen-yl)-2-meth-oxy-2-oxoeth-yl][2-(thio-phen-2-yl)eth-yl]ammonium (+)-camphor-10-sulfonate acetone monosolvate.

The title compound, C(15)H(17)ClNO(2)S(+)·C(10)H(15)O(4)S(-)·C(3)H(6)O, was synthesized by N-alkyl-ation of α-amino-(2-chloro-phen-yl)acetate with 2-thienylethyl p-toluene-sulfonate, followed by reaction with (+)-camphor-10-sulfonic acid. In the crystal, the cations and anions are linked through N-H⋯O hydrogen bonds. The thio-phene ring of the cation was found to be disordered over two sites, with refined occupancies of 0.798 (4) and 0.202 (4).