[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8](=O)[CH2:9][NH:10][CH2:11][C:12]([O:14][CH3:15])=[O:13])=[CH:4][CH:3]=1.[N-:17]=[C:18]=[O:19].[K+]>CO.O.O.CO>[CH3:15][O:14][C:12](=[O:13])[CH2:11][N:10]1[CH:9]=[C:8]([C:5]2[CH:6]=[CH:7][C:2]([Cl:1])=[CH:3][CH:4]=2)[NH:17][C:18]1=[O:19]A solution of 3.41 g (12.27 mmol) of the compound from Example 231A in 14 ml methanol/water (7:3) is added dropwise to a solution of 995 mg (12.27 mmol) of potassium isocyanate in 11 ml methanol/water (7:3). This is stirred for 1 hr at RT. The thick suspension is diluted with 7.4 ml water and 39 ml methanol to facilitate stirring, then heated under reflux for 1 hr and then left to stand overnight at RT. After cooling to 0° C., the precipitate is filtered off, washed with ice-cold water and dried overnight in the drying cabinet at 60° C. 2.84 g (76% of theory) of the title compound are obtained.
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