[Br:1][C:2]1[CH:3]=[CH:4][C:5]([NH:8][C:9]([NH2:11])=[S:10])=[N:6][CH:7]=1.[CH2:12]([O:14][C:15](=[O:20])[C:16](=O)[CH2:17]Br)[CH3:13].O>CN(C=O)C>[CH2:12]([O:14][C:15]([C:16]1[N:11]=[C:9]([NH:8][C:5]2[CH:4]=[CH:3][C:2]([Br:1])=[CH:7][N:6]=2)[S:10][CH:17]=1)=[O:20])[CH3:13](5-Bromo-pyridine-2-yl)-thiourea (1 mmol) is dissolved in DMF (2 ml) and 3-Bromo-2-oxo-propionic acid ethyl ester (1 eq.) is added and stirred 2 h at 70° C. The suspension is diluted with DMF (2 ml). After cooling to RT the reaction solution is poured into water and the resulting precipitate is filtered, washed with water and dried 16 h in vacuo at 40° C. “A4” is obtained as colourless powder in a yield of 78%; mp. 299.8-300.8° C.; HPLC (method C): 2.01 min; LC-MS (method A): 2.002 min, 327.95 (M+H+);
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