The mol-ecule of the title compound, C(9)H(9)N(5)O, is essentially planar (r.m.s. deviation of all atoms = 0.02 Å) except for the NH(2) H atoms. An intra-molecular hydrazinyl-idene-carbonyl N-H⋯O=C hydrogen bond is present. In the crystal, mol-ecules are connected via N-H⋯N/O hydrogen bonds, forming thick layers parallel to (100).

There are two independent mol-ecules in the asymmetric unit of the title compound, C(13)H(9)BrClN(3)O(2), in which the dihedral angles between the benzene and pyridine rings are 8.23 (9)° and 52.84 (12)°. Both the mol-ecules exist in an E configuration with respect to the C=N double bond. The two mol-ecules in the asymmetric unit are linked via weak C-H⋯O hydrogen bonds. In both the mol-ecules,...

The title compounds, C17H13NO2S, (I), C17H13NO3S, (II), and C24H17ClN2O5S·CHCl3, (III), are indole derivatives. Compounds (I) and (II) crystalize with two independent mol-ecules in the asymmetric unit. The indole ring systems in all three structures deviate only slightly from planarity, with dihedral angles between the planes of the pyrrole and benzene rings spanning the tight range 0.20 (9)-1....

The asymmetric unit of the title compound, C(15)H(15)NO, contains two independent mol-ecules, both of which exist in trans configurations with respect to the C=N bonds [1.278 (2) and 1.279 (2) Å]. In each mol-ecule, intra-molecular O-H⋯N hydrogen bonds generate S(6) ring motifs. In one mol-ecule, the benzene rings form a dihedral angle of 13.38 (9)°, while in the other mol-ecule the dihedral an...

BACKGROUND Arginine vasopressin (AVP) not only acts directly on blood vessels through V1 receptor stimulation but also may modulate adrenergic-mediated responses in animal experiments in vivo and in vitro. The aim of the present study was to investigate whether AVP can contribute to an abnormal adrenergic constrictor response of human saphenous veins. METHODS AND RESULTS Saphenous vein rings ...

The asymmetric unit of the title compound, C(18)H(11)NO(2)S, contains two crystallographically independent mol-ecules. In one mol-ecule, the oxazole and thio-phene rings are oriented at dihedral angles of 17.40 (9) and 18.18 (7)° with respect to the naphthalene ring system, while the oxazole and thio-phene rings are oriented to each other at a dihedral angle of 0.86 (9)°. In the other mol-ecule...

The title compound, 3C(7)H(9)ClO(3)·CHCl(3), crystallizes with mol-ecules of 3-exo-chloro-8-oxabicyclo-[3.2.1]oct-6-ene-2,4-diol (A) and chloro-form in a 3:1 ratio, in the space group R3m. Mol-ecules of A straddle a crystallographic mirror plane, whereas the chloro-form mol-ecules (C and H atoms) lie additionally on the threefold axis. The mol-ecules of A are linked into right- and left-helical...

The title compound, C(15)H(15)N(3)O, was obtained by a condensation reaction between o-amino-acetophenone and benzoyl hydrazine. The mol-ecule displays an E configuration about the C=N bond. Intra-molecular N-H⋯N hydrogen bonds are formed between the 2-amino-phenyl and imine groups. In the crystal, dimers are formed between mol-ecules linked by inter-molecular N-H⋯O hydrogen bonds from the 2-am...

In the title solvate, C29H30N2O3·CHCl3, the dihedral angle between the indole ring system (r.m.s. deviation = 0.050 Å) and the 4-methyl-pyrrolidine ring is 88.88 (8)°. The latter ring adopts an envelope conformation with the N atom as the flap. Its mean plane makes dihedral angles of 86.94 (11) and 42.08 (9)° with the phenyl and di-methyl-benzene rings, respectively. The mol-ecular conformation...

The asymmetric unit of the title compound, C(8)H(7)Br(2)NO(3), comprises two crystallographically independent mol-ecules (A and B). The nitro groups are twisted from the attached benzene rings, making dihedral angles of 39.26 (9) and 35.90 (9)° in mol-ecules A and B, respectively. In each mol-ecule, the dibromo-methyl group is orientated in such a way that the two Br atoms are tilted away from ...