C([O:3][C:4](=[O:27])[CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][N:11]1[C:15]2[CH:16]=[CH:17][CH:18]=[CH:19][C:14]=2[N:13]([C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)[C:12]1=[O:26])C.[OH-].[Na+]>>[O:26]=[C:12]1[N:11]([CH2:10][CH2:9][CH2:8][CH2:7][CH2:6][CH2:5][C:4]([OH:27])=[O:3])[C:15]2[CH:16]=[CH:17][CH:18]=[CH:19][C:14]=2[N:13]1[C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1The product is produced as described in example 22 from 16 g. of 7-(2-oxo-3-phenyl-benzimidazolin-1-yl)-enanthic acid ethyl ester and 2.1 g. of NaOH.
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