InChI=1/C14H14N4O4/c1-3-21-13(19)9-5-7-15-11(17-9)12-16-8-6-10(18-12)14(20)22-4-2/h5-8H,3-4H2,1-2H [2,2'-bipyrimidine]-4,4'-dicarboxylic acid, diethyl ester diethyl 2,2'-bipyrimidine-4,4'-dicarboxylate