Erratum: 4-[3-(Chloro-meth-yl)-1,2,4-oxadiazol-5-yl]pyridine. Corrigendum.

The title and the chemical diagram of the paper by Kang, Li, Zeng, Wang & Wang [Acta Cryst. (2007), E63, o4654] are corrected.[This corrects the article DOI: 10.1107/S1600536807055559.].

3-(2-Bromo-4,5-dimethoxy-phen-yl)propiononitrile.

In the mol-ecule of the title compound, C(11)H(12)BrNO(2), a weak intra-molecular C-H⋯Br hydrogen bond results in the formation of a five-membered ring, which adopts an envelope conformation with the H atom displaced by 0.486 Šfrom the plane of the other ring atoms. In the crystal structure, inter-molecular C-H⋯O hydrogen bonds link the mol-ecules.

Ethyl 5-formyl-2,4-dimethyl-1H-pyrrole-3-carboxyl-ate.

The molecule of the title compound, C(10)H(13)NO(3), is approximately planar. A network of N-H⋯O and weak C-H⋯O hydrogen bonds helps to consolidate the crystal structure.

2-Chloro-N-(4-fluoro-phen-yl)acetamide.

In the title compound, C(8)H(7)ClFNO, an intra-molecular C-H⋯O hydrogen bond forms a six-membered ring. In the crystal structure, mol-ecules are linked by inter-molecular N-H⋯O hydrogen bonds, forming infinite chains along the c axis.

2-[3,4-Dibut-oxy-5-(5-phenyl-1,3,4-oxadiazol-2-yl)-2-thien-yl]-5-phenyl-1,3,4-oxadiazole.

In the title compound, C(28)H(28)N(4)O(4)S, the dihedral angles between the central thio-phene ring and its pendant oxadiazole rings are 1.2 (3) and 9.8 (3)°. The dihedral angles between the oxadiazole and phenyl rings are 2.9 (3) and 1.8 (3)°. Some short intra-molecular C-H⋯O contacts occur.

5,5'-Diethyl-2,2'-(triazene-1,3-di-yl)di-1,3,4-thia-diazole.

In the mol-ecule of the title compound, C(8)H(11)N(7)S(2), the conformation about the N=N bond is trans and the thia-diazole rings are oriented at a dihedral angle of 2.92 (3)°. In the crystal structure, inter-molecular N-H⋯S hydrogen bonds link the mol-ecules into chains. There are π-π contacts between the thia-diazole rings [centroid-to-centroid distances = 3.699 (3) and 3.720 (2) Å].

1-Methyl-1H-indazole-3-carboxylic acid.

The asymmetric unit of the title compound, C(9)H(8)N(2)O(2), contains two mol-ecules. In the crystal structure, both mol-ecules form inversion dimers via pairs of O-H⋯O hydrogen bonds, and a C-H⋯O inter-ation is also seen.