C(O[C:4](=[O:14])[C:5]([C:8]1[CH:9]=[N:10][CH:11]=[CH:12][CH:13]=1)=[CH:6]O)C.[NH:15]([C:17]1[CH:22]=[C:21]([CH3:23])[CH:20]=[CH:19][N:18]=1)[NH2:16].C([O-])C.[Na+].Cl>C(O)C>[CH3:23][C:21]1[CH:20]=[CH:19][N:18]=[C:17]([N:15]2[C:4](=[O:14])[C:5]([C:8]3[CH:9]=[N:10][CH:11]=[CH:12][CH:13]=3)=[CH:6][NH:16]2)[CH:22]=11.53 g (7.90 mmol) of the compound from Example 2A and 2.92 g (23.7 mmol) of the compound from Example 1A are dissolved 2 ml anhydrous ethanol under argon and the mixture is stirred at RT for 16 h. 537 g (7.90 mmol) sodium ethanolate are added, the reaction solution becoming dark red in color. The mixture is subsequently stirred at RT for 30 min and 7.9 ml 1 M hydrochloric acid are then added. The solution is partly concentrated, a precipitate separating out. This is filtered off, washed with water (twice with 5 ml each time) and with MTBE (5 ml) and dried in vacuo. 435 mg (22% of th.) of the title compound are obtained.
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