In the crystal structure of the title compound, C(18)H(14)N(4), the mol-ecule assumes site symmetry with the centroid of the benzene ring located on the inversion center. The mol-ecule is almost flat, with a dihedral angle of 2.70 (9)° between the pyridine and benzene rings.

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The title compound (cimifugin), C(16)H(18)O(6)·0.5CH(3)OH, was isolated from the rhizome of Actaea asiatica Hara. The asymmetric unit contains two independent mol-ecules and a solvent methanol mol-ecule. The five-numbered ring adopts an envelope conformation in each molecule. Intra- and inter-molecular O-H⋯O hydrogen bonds stabilize the crystal structure.

The title compound, C(23)H(18)O(4), is a 1,4-enedione compound which contains a naphthalene ring and a benzene ring. The dihedral angle between the ring systems is 74.9 (2)°. In the crystal, the mol-ecules form π-π stacking inter-actions between naphthalene rings of inversion-related mol-ecules, with an inter-planar spacing of 3.499 (2) Å.

The title compound, C(20)H(18)N(4), is a flexible 3,3'-bipyridyl-type ligand with a long spacer group between the two pyridyl functions. The mol-ecule crystallizes around an inversion center, with one half-mol-ecule in the asymmetric unit and a dihedral angle of 71.85 (8)° between the pyridine ring and the central benzene ring.

In the title compound, C16H15FN2O, the dihedral angles between the benzene rings are74.7(8), 74.1 (1), 74.2 (7) and 74.3 (5)° in the four independent mol-ecules in the asymmetric unit. In the crystal, N-H-O hydrogen bonds involving the hydrazide and acetyl groups, which form R2(2)(18) ring motifs, link the mol-ecules into dimers, which form columns along [010].

In the title compound, C(17)H(18)N(2)S, the imidazolidine ring adopts a twisted conformation. In the crystal, mol-ecules are linked by slipped π-π inter-actions between the benzene rings of neighbouring mol-ecules [centroid-to-centroid distance = 3.903 (2) Å].

In the title compound, 2C(18)H(16)N(2)O(2)·H(2)O, the dihedral angles between the quinoline rings and the benzene rings in the two independent acetamide mol-ecules are 80.09 (5) and 61.23 (5)°. The crystal packing is stablized by O-H⋯N and N-H⋯O hydrogen bonds between the acetamide and water mol-ecules.

In the title mol-ecule, C(16)H(17)N(3)O, the two aromatic rings form a dihedral angle of 4.51 (18)°. In the crystal structure, inter-molecular N-H⋯O hydrogen bonds link mol-ecules related by translation along the a axis into ribbons.

The mol-ecular conformation of the title compound, C(19)H(18)O(2), is stabilized by an intra-molecular O-H-O hydrogen bond. In addition, inter-molecular O-H-O inter-actions link the mol-ecules into zigzag chains running along the c axis.