1,4-Di­hydro-3,6-dipyrazin-2-yl-1,2,4,5-tetra­zine–benzene-1,3-di­carboxylic acid (1/1). Retraction

In November 2006, we (Ji-Lin Lu, Da-Shun Zhang, Lin Li and Bei-Ping Liu) published a paper on the crystal structure of 1,4-dihydro-3,6-dipyrazin-2-yl-1,2,4,5-tetra­zine–benzene-1,3-dicarboxylic acid (1/1) [Acta Cryst. (2006), E62, o4855–o4857]. The synthesis and characterization of the compound, the X-ray data collection, crystal structure solution and refinement were carried out in the laboratory of Professor Miao Du, Tianjin Normal University, People's Republic of China. We obtained this crystallographic information from his student and published the paper without Professor Du's permission. We now retract this paper and offer our sincere apologies to Professor Du.