The title mol-ecule, C(8)H(7)N(3)O, is almost planar, with a maximum deviation of 0.0232 (2) Å from the least-squares plane. The Z conformation of the C=N double bond is stabilized by an intra-molecular N-H⋯O hydrogen bond. In the crystal, adjacent mol-ecules are linked by inter-molecular N-H⋯N and N-H⋯O hydrogen bonds, forming zigzag sheets parallel to the c axis; the sheets are further stabil...

In the title compound, C(17)H(15)NO, the dihedral angle between the phenyl rings is 80.1 (2)°. In the crystal, mol-ecules are linked by pairs of N-H⋯O hydrogen bonds, forming inversion dimers.

In the title compound, C(9)H(6)ClNO, the Cl atom deviates by 0.142 (1) Å from the quinoline ring mean plane (r.m.s. deviation = 0.013 Å). In the crystal, N-H⋯O hydrogen bonds link the mol-ecules into [010] C(4) chains. Aromatic π-π stacking inter-actions [shortest centroid⋯centroid distance = 3.685 (3) Å] are also observed.

To this point, the class has dealt mainly with known, characterized gene sequences. We have learned several methods of comparing genes in hopes of quantifying divergence, highlighting similar gene segments which have been preserved among species, and finding optimal alignments of sequences such that we are better able to understand the ”evolution” of the sequence. We have used BLAST, hashing, p...

The mol-ecule of the title compound, C(10)H(6)N(2)O, is nearly planar [maximum deviation = 0.030 (1) Å]. The CN(2) moiety is almost linear, with a C-N-N angle of 175.50 (14)°. A single inter-molecular C-H⋯O hydrogen bond is observed in the crystal structure. A π-π inter-action is also observed with the shortest distance being 3.6832 (12) Å between the the centroids of the six-membered rings.

The crystal structure determination of the title compound, C(15)H(14)N(2)O, confirms the cis relationship between the phenyl groups at the 4- and 5-positions on the imidazolidine ring. The dihedral angle between the two phenyl rings is 48.14 (6)°. In the crystal structure, inter-molecular N-H⋯O hydrogen bonds link mol-ecules into centrosymmetric dimers. These dimers are, in turn, linked into a ...

In an asymmetric unit of the title compound, C(8)H(12)N(2)S(4), there are two crystallographically independent half mol-ecules lying on inversion centers. One of the mol-ecules is disordered over two positions with relative occupancies of 82.0 (2) and 18.0 (2) for the major and minor components. In the crystal structure, mol-ecules are linked into a three-dimensional framework via inter-molecul...