C[O:2][C:3]([C:5]1[CH:13]=[C:12]2[C:8]([C:9]([CH2:16][C:17]3[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=3)([CH3:15])[C:10](=[O:14])[NH:11]2)=[CH:7][CH:6]=1)=[O:4].[OH-].[Na+].C(O)C.O>O1CCCC1>[CH2:16]([C:9]1([CH3:15])[C:8]2[C:12](=[CH:13][C:5]([C:3]([OH:4])=[O:2])=[CH:6][CH:7]=2)[NH:11][C:10]1=[O:14])[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1In a manner similar to that of Example 1C, by reacting 3-Benzyl-3-methyl-2-oxo-2,3-dihydro-1H-indole-6-carboxylic acid methyl ester (1.06 mmol) obtained in Example 19(B), sodium hydroxide (260 mg, 6.5 mmol), ethanol (10 ml) and water (1 ml) in tetrahydrofuran (10 ml), expected derivative was obtained as a white solid.
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