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The crystal structure of the title compound, C7H8N2O3, contains a 1:1 mixture of two tautomers, viz. ethyl 6-oxo-1,6-dihydro­pyrimidine-5-carboxyl­ate and ethyl 4-oxo-1,4-dihydro­pyrimidine-5-carboxyl­ate. The mol­ecules are linked into a three-dimensional network by N—H⋯O, C—H⋯O and C—H⋯N hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, [Mo2(C2H4NO2)2O2S2(C2H5NO2)], the two MoVatoms are bridged by two μ2-S atoms and one glycine ligand in an O:O'-bidentate mode. In addition, each MoVatom is bonded to one terminal oxygen ligand and chelated by one N,O-bidentate glycinate ligand, resulting in a distorted octahedral coordination. A complex hydrogen-bonding network is constructed by intermolecular NH⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, C14H11NS, the two benzene rings make a dihedral angle of 22.0 (2)°. The cyano group and the S atom are coplanar with their corresponding benzene rings. [ABSTRACT FROM AUTHOR]

The title compound, C20H12N4O4, contains two benzene rings ortho bonded to a quinoxaline nucleus. The dihedral angle between the benzene rings is 59.2 (4)°. The two benzene rings adopt a trans configuration with respect to the quinoxaline plane. The formal C—C σ-bond substituted by nitrophenyl groups is shorter than normal C—C bonds and the C(benzene)—C(quinoxaline) bonds. These features are consistent with electron delocalization over the whole molecule. [ABSTRACT FROM AUTHOR]

In the title compound, C20H12Br2N2, the two bromobenzene rings are inclined at 58.7 (2)° to each other, and at 43.7 (2) and 53.9 (2)° to the quinoxaline ring system. [ABSTRACT FROM AUTHOR]

In the title compound, C20H12Cl2N2, the two benzene rings make dihedral angles of 57.3 (2) and 35.0 (2)° with the quinoxaline ring system. [ABSTRACT FROM AUTHOR]