Oxidation of 5,6-Diamino-1,3-dimethyluracil by Metal Ions: Structure of 1,3,6,8-Tetramethyl-2,4,7,9(1H,3H,6H,8H)-pyrimido[4,5-g]pteridinetetrone

Abstract

The structure of the title compound, C 12 H 12 N 6 O 4 , consists of independent tricyclic molecules with a central pyrazine ring and terminal pyrimidine rings. The molecular centroid coincides with a crystallographic inversion centre, leading to a trans disposition of the terminal pyrimidine rings. The angle between the central pyrazine ring and the pyrimidine rings is 4.2 (3)°, indicating that the molecule is almost planar