InChI=1/C12H14N4O4/c1-3-19-11(17)7-5-13-9(15-7)10-14-6-8(16-10)12(18)20-4-2/h5-6H,3-4H2,1-2H3,(H,13,15)(H,14,16 [2,2'-bi-1H-imidazole]-4,4'-dicarboxylic acid, diethyl ester diethyl 1H,1'H-2,2'-biimidazole-4,4'-dicarboxylate