Dichloridobis(1-ethyl-2,6-dimethyl­pyridinium-4-olate-κO)zinc(II)

In the title compound, [ZnCl2(C9H13NO)2], the ZnII ion is coordinated by two Cl− anions and two O atoms of two zwitterionic organic ligands in a distorted tetra­hedral arrangement. In the crystal, mol­ecules are linked into sheets parallel to the bc plane by C—H⋯Cl and C—H⋯O hydrogen bonds and weak π–π inter­actions [centroid–centroid distance = 3.669 (1) Å]

c-3,t-3-Dimethyl-4-oxo-r-2,c-6-diphenyl­piperidine-1-carboxamide

In the title compound, C26H26N2O2, the piperidinone ring adopts a distorted boat conformation. The two phenyl rings substituted at positions 2 and 6 of the piperidinone ring occupy axial and equatorial orientations, which are approximately perpendicular to each other [89.14 (8)°]. The phenyl­carbamoyl group adopts an extended conformation. The crystal structure is stabilized by inter­molecular C—H⋯O inter­actions

c-3,t-3-Dimethyl-r-2,c-6-diphenyl­piperidin-4-one

In the title compound, C19H21NO, the piperidine ring adopts a chair conformation. The two phenyl rings attached to the piperidine ring at 2 and 6 positions occupy equatorial orientations and the dihedral angle between them is 57.53 (11)°. In the crystal, the mol­ecules are connected via weak inter­molecular C—H⋯π inter­actions, leading to a zigzag chains

Dibromidobis(1-ethyl-2,6-dimethyl­pyridinium-4-olate-κO)zinc(II)

In the bioactive title compound, [ZnBr2(C9H13NO)2], the ZnII atom is coordinated in a distorted tetra­hedral arrangement by two Br− anions and the O atoms of two zwitterionic organic ligands. The pyridinium rings are almost planar [maximum deviations = 0.004 (4) and 0.003 (4) Å]. The ethyl groups are approximately perpendicular to the corresponding pyridinium ring planes [N—C—C—C = 88.8 (4)° in each ligand]. The packing of the mol­ecules is controlled by π–π inter­actions, with centroid–centroid distances of 3.625 (3) and 3.711 (2) Å, forming chains approximately parallel to (102). The crystal studied was non-merohedrally twinned (twin relationship between the domains 1 0 0, 0 1 0, −0.4672 −0.1864 −1 and batch scale factor of 7.39%)

1,1′-[4-(4-Methoxy­phen­yl)-2,6-dimethyl-1,4-dihydro­pyridine-3,5-di­yl]diethanone

In the title compound, C18H21NO3, which belongs to the family of calcium channel blockers, the dihydropyridine ring assumes a flattened boat conformation. The two carbonyl units adopt a synperiplanar conformation with respect to the double bonds in the dihydro­pyridine ring. The methoxy­phenyl ring is almost perpendicular to the prydine ring [dihedral angle = 89.01 (7)°]. In the crystal, the mol­ecules are connected by inter­molecular N—H⋯O hydrogen bonds

tert-Butyl 3-[2,2-bis­(ethoxy­carbon­yl)vin­yl]-2-bromo­methyl-1H-indole-1-carboxyl­ate

In the title compound, C22H26BrNO6, the indole ring system is planar [maximum deviation 0.029 (2) Å]. The tert-butyl bound carboxyl­ate group forms a dihedral angle of 17.54 (8)° with the indole ring system. In the crystal, mol­ecules are linked into centrosymmetric R 2 2(10) dimers by paired C—H⋯O hydrogen bonds

Methyl 4-(3-eth­oxy-4-hydroxy­phen­yl)-6-methyl-2-oxo-1,2,3,4-tetra­hydro­pyrimidine-5-carboxyl­ate monohydrate

In the title compound, C15H18N2O5·H2O, the pyrimidine ring adopts a flattened-boat conformation. The eth­oxy group attached to the benzene ring is in an extended conformation. The oxopyrimidine mol­ecules are linked into centrosymmetric R 2 2(20) dimers by O—H⋯O hydrogen bonds. The dimers are linked by N—H⋯O hydrogen bonds, forming a two-dimensional network parallel to the bc plane. Adjacent networks are cross-linked via N—H⋯O and O—H⋯O hydrogen bonds involving the water mol­ecules

Private reputation retrieval in public - a privacy-aware announcement scheme for VANETs

An announcement scheme is a system that facilitates vehicles to broadcast road-related information in vehicular ad hoc networks (VANETs) in order to improve road safety and efficiency. Here, the authors propose a new cryptographic primitive for public updating of reputation score based on the Boneh–Boyen–Shacham short group signature scheme. This allows private reputation score retrieval without a secure channel. Using this, the authors devise a privacy-aware announcement scheme using reputation systems which is reliable, auditable, and robust

N-[(2-Hydr­oxy-5-methoxy­phen­yl)(3-nitro­phen­yl)meth­yl]acetamide

In the title compound, C16H16N2O5, the meth­oxy group is disordered with site occupancies of 0.20 (3) and 0.80 (3). The dihedral angle between the two aromatic rings is 73.7 (2)°. The crystal structure is characterized by intermolecular N—H⋯O, O—H⋯O, C—H⋯O and C—H⋯π hydrogen bonds