1: 4H,9H-diimidazolt;1,5-a; 1',5'-dgt;pyrazine-5,10-dione-1,6-dicarboxylic dichloride; benzylamine With N-ethyl-N,N-diisopropylamine in tetrahydrofuran T=-78°C; 24 h; 2: N-butylamine in tetrahydrofuran T=-78 - 20°C; 20 h; Further stages.;