torsion of the gallbladder is a relatively rare surgical disease which mimics acute cholecystitis' symptoms that usually would not be respondable to medical therapies. the torsion would mostly be diagnosed intra-operatively. cholecystectomy is the treatment of choice. in general in our centre, general surgery department, imam reza hospital, mashhad, iran, since 1986 over 14000 cholecystect...

The title mol-ecule, C(21)H(26)O(3), has a six-membered planar carbon ring as the central core, substituted at position 1 with phen-oxy-carbonyl, at position 2 with hy-droxy and at positions 3 and 5 with tert-butyl groups. The structure shows two independent but very similar mol-ecules within the asymmetric unit. For both independent mol-ecules, the ester carboxyl-ate group is coplanar with the...

The asymmetric unit of the title compound, C(20)H(24)N(2)O(6), contains one half-mol-ecule, the complete mol-ecule being generated by a crystallographic inversion centre. The mol-ecule is nearly planar with a dihedral angle between the two benzene rings of 0.03 (4)° and the central C/N/N/C plane making a dihedral angle of 8.59 (7)° with each of its two adjacent benzene rings. The two meth-oxy g...

Two independent thio-urea mol-ecules comprise the asymmetric unit of the title compound, C(22)H(20)N(2)OS. The central N-C(=S)N(H)C(=O) atoms in each mol-ecule are virtually superimposable and each is twisted [C-N-C-S torsion angles = 121.3 (3) and -62.3 (4)°]. The mol-ecules differ only in terms of the relative orientations of the benzyl benzene rings [major difference between the C-N-C-C tors...

The title compound, C(17)H(12)N(2), comprises a norbornane unit having a dicyanona-phthalene ring fused on one side. Both cyano groups are twisted slightly out of the plane of the naphthalene ring system [C-C-C-C torsion angle = 1.9 (2)°]. In the crystal, inversion-related mol-ecules are linked by pairs of weak C-H⋯N hydrogen bonds, forming dimers.

The asymmetric unit of the title compound, C(8)H(8)ClNO(3)S, contains two independent mol-ecules in which the C-S-N-C torsion angles are -71.7 (3) and 61.2 (3)°. The benzene rings and the SO(2)-NH-CO-C segments form dihedral angles of 80.2 (1) and 88.1 (2)° in the two independent mol-ecules. In the crystal, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into chains in the b-axis direc...

In the title compound, C(15)H(17)N(3)O, the 1H-imidazo[4,5-c]quinoline ring system is approximately planar, with a maximum deviation of 0.036 (1) Å. The C-N-C-C torsion angles formed between this ring system and the isobutyl unit are -99.77 (16) and 79.71 (17)°. In the crystal, inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into chains along the c axis.

In the chiral title compound, C(15)H(22)N(4)O(2)S(2), there are two mol-ecules in the asymmetric unit with distinctly different conformations, as quanti-fied by torsion angles. The dihedral angles between the thio-imidazole rings are 81.59 (5) and 67.04 (4)°. One mol-ecule exhibits local twofold rotation symmetry, while the other displays no local symmetry. Inter-molecular C-H⋯O and C-H⋯S inter...

The title compound, C28H20O4, was synthesized by a bimolecular Zn-HCl reduction in glacial acetic acid using the meth-oxy-substituted xanthone as a starting material. The crystal structure shows that the 2,2'-meth-oxy-bixanthenyl-idene unit is an E-type conformation anti-folded conformer. The mol-ecule lies on an inversion center. The meth-oxy group is almost coplanar with the attached benzene ...

The title compound, C(16)H(16)N(2)O(5)S, is a potent new fungicide. There are two mol-ecules in the asymmetric unit which are linked by C-H⋯π inter-actions, forming a dimer. The two phenyl rings in each mol-ecules are almost coplanar, with C-N-C-C torsion angles of 177.6 (2) and -172.5 (2)°. There are inter-molecular and intra-molecular N-H⋯O hydrogen bonds in the crystal structure.