The isomeric N-(iodophenyl)nitrobenzamides, C(13)H(9)IN(2)O(3), all form different three-dimensional framework structures. Molecules of N-(2-iodophenyl)-3-nitrobenzamide (II) are linked by a combination of N-H...O and C-H...O hydrogen bonds and a two-centre iodo...carbonyl interaction. The supramolecular structure of N-(2-iodophenyl)-4-nitrobenzamide (III) is built from one N-H...O and two C-H....

The title compound, (C(6)H(7)N(2)O)[FeCl(4)], contains two carbamylpyridinium (picolinamidinium) cations, which are linked into chains by N(+)-H⋯O hydrogen bonds formed between protonated pyridyl N atoms and carbonyl groups. Tetra-chloridoferrate(III) anions lie between these chains, accepting N-H⋯Cl hydrogen bonds from both H atoms of the picolinamidium -NH(2) group.

The title compound, C(18)H(15)OP·C(13)H(17)N(2)O(3), belongs to a series of mol-ecular systems based on triphenyl-phosphine oxide. The O atom of the oxide group acts as an acceptor for hydrogen bonds from -OH groups of the nitronyl nitroxide. The crystal structure is stabilized by O-H⋯O hydrogen bonds.

In the title compound, C(9)H(6)FNO(2), the carboxyl group is twisted slightly away from the indole-ring plane [dihedral angle = 7.39 (10)°]. In the crystal, carboxyl inversion dimers linked by pairs of O-H⋯O hydrogen bonds generate R(2) (2)(8) loops and N-H⋯O hydrogen bonds connect the dimers into (10[Formula: see text]) sheets.

In the title compound, C(16)H(19)N(3)O(5)S, the dihedral angle between the benzene ring and the carbonyl-amino group is 18.18 (2)°. In the crystal, mol-ecules form centrosymmetric dimers via pairs of N-H⋯N hydrogen bonds. The dimers are connected via N-H⋯O hydrogen bonds into a three-dimensional network..

In the title mol-ecule, C(9)H(6)BrNO(2), the dihedral angle between the -COOH group and the ring system is 6 (4)°. In the crystal, pairs of O-H⋯O hydrogen bonds link the mol-ecules into inversion dimers and these dimers are connected via N-H⋯O hydrogen bonds to form layers parallel to the (-101) plane.

In the title compound, C(39)H(45)NO(7),the pyrrolidine ring is connected to an estrone group, a trimeth-oxy benzene and a phenyl ring. The pyrrolidine ring exhibits a twist conformation and the other five-membered ring an envelope conformation. Mol-ecules are linked by N-H⋯O hydrogen bonds, C-H⋯π inter-actions and C-H⋯O hydrogen bonds.

In the title mol-ecular salt, C6H9N2 (+)·C7H5O3 (-), the dihedral angle between the benzene ring and the CO2 group in the anion is 6.1 (2)°. In the crystal, the cation and anion are linked by N-H⋯O and C-H⋯O hydrogen bonds, and the anions are connected by O-H⋯O hydrogen bonds, forming a three-dimensional network.

The conformation of the N-H and C=O bonds in the title compound, C(8)H(7)Cl(2)NO(3)S, is trans. The benzene ring and the SO(2)-NH-CO-C group form a dihedral angle of 79.75 (8)°. Mol-ecules are connected via N-H⋯O hydrogen bonds to form linear supra-molecular chains.

What has been your biggest error? Back at the beginning of this century, I used to say “I am going to spend the rest of my life trapped in a mitochondrion!”. This was because I was convinced that it was never going to be possible to retrieve even partial extinct genomes. Now, there are genomic sequences for many ancient humans and animals. This goes back to the famous Arthur C. Clarke quote: “W...