4-Bromo-1H-pyrrole-2-carb-oxy-lic acid.

In the title compound, C(5)H(4)BrNO(2), the non-H atoms of the pyrrole ring and the Br atom are approximately coplanar, with an r.m.s.

9-Allyl-9H-carbazole-3,6-dicarbaldehyde.

In the title mol-ecule, C(17)H(13)NO(2), the allyl group is almost perpendicular to the carbazole mean plane, with a dihedral angle of 89.0 (2)°. In the crystal, nonclassical C-H⋯O hydrogen bonds link the mol-ecules into corrugated sheets parallel to the bc plane.

A second monoclinic polymorph of 1-benzyl-N-methyl-1H-pyrrole-2-carboxamide.

In the title compound, C(13)H(14)N(2)O, the N(pyrrole)-C(H(2))-C-C torsion angle is -7.7 (3)° and the dihedral angle between the pyrrole and benzene rings is 83.6 (2)°.

rac-Dimethyl 2-(1H-pyrrole-2-carboxamido)-butane-dioate.

The title compound, C(11)H(14)N(2)O(5), was synthesized by condensation of (RS)-2-amino-succinic acid dimethyl ester with 2-trichloro-acetyl-pyrrole at room temperature. The amide group is twisted by 7.4 (1)° from the plane of the pyrrole ring.

Methyl 2-(1H-indole-3-carboxamido)-acetate.

The title compound, C(12)H(12)N(2)O(3), was synthesized by condensation of methyl amino-acetate with 3-trichloro-acetyl-indole. In the crystal, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into chains parallel to the b axis. The chains are further connected into a three-dimensional network by N-H⋯O hydrogen bonds involving the indole N atom.

1-Benzyl-N-methyl-1H-pyrrole-2-carboxamide.

The asymmetric unit of the title compound, C(13)H(14)N(2)O, contains two independent mol-ecules, which differ in the twist of the phenyl ring: the N(pyrrole)-C(H(2))-C-C torsion angles are -73.0 (3) and 17.1 (3)°.

Methyl 3-(1H-indole-3-carboxamido)propionate hemihydrate.

The title compound, C(13)H(14)N(2)O(3)·0.5H(2)O, was synthesized by the condensation of methyl 3-amino-propionate with 3-trichloro-acetyl-indole. The two organic mol-ecules in the asymmetric unit are both close to planar, with r.

2-Iodo-5-nitro-thio-phene.

The title compound, C(4)H(2)INO(2)S, was synthesized by nitration of iodo-thio-phene with acetyl nitrate. The molecule is essentially planar, withthe nitro group tilted by 1.78 (19)° and the iodine atom displaced by 0.

1H-Pyrrole-2-carboxylic acid.

In the title compound, C(5)H(5)NO(2), the pyrrole ring and its carboxyl substituent are close to coplanar, with a dihedral angle of 11.7 (3)° between the planes. In the crystal structure, adjacent mol-ecules are linked by pairs of O-H⋯O hydrogen bonds to form inversion dimers.

1-Ethyl-1H,6H-pyrrolo[2,3-c]azepine-4,8(5H,7H)-dione.

The title compound, C(10)H(12)N(2)O(2), was synthesized by cyclization of 3-(1-ethyl-pyrrole-2-carboxamido)propanoic acid in the presence of polyphospho-ric acid and diphospho-rus pentoxide. In the crystal structure, adjacent mol-ecules are linked by N-H⋯O hydrogen bonds, forming chains extending along the b axis.

3-(1-Ethyl-1H-pyrrole-2-carboxamido)propionic acid monohydrate.

The title compound, C(10)H(14)N(2)O(3)·H(2)O, was synthesized by alkyl-ation of methyl 3-(1H-pyrrole-2-carboxamido)-propion-ate with ethyl bromide, followed by saponification and acidification. In the crystal structure, inter-molecular O-H⋯O and N-H⋯O hydrogen bonds link the mol-ecules, forming layers parallel to the ac plane.

Methyl 3-[(1-butyl-1H-indol-3-yl)carbonyl-amino]propionate.

In the title mol-ecule, C(17)H(22)N(2)O(3), the mean plane of the terminal (C=O)OMe fragment and the indole plane form a dihedral angle of 78.94 (3)°. Inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into chains extended along the c axis.

Methyl (1H-pyrrol-2-ylcarbonyl-amino)acetate.

In the crystal structure of the title compound, C(8)H(10)N(2)O(3), mol-ecules are linked by N-H⋯O hydrogen bonds, forming ribbons of centrosymmetric dimers extending along the c axis.