ClC1C=C2C(=CC=1)N([N+:11]([O-:13])=[O:12])C(C(OCC)=O)=C2.[Cl:19][C:20]1[CH:21]=[C:22]2[C:26](=[C:27](Cl)[CH:28]=1)[NH:25][C:24]([C:30]([OH:32])=[O:31])=[CH:23]2>>[N+:11]([C:21]1[C:20]([Cl:19])=[CH:28][CH:27]=[C:26]2[C:22]=1[CH:23]=[C:24]([C:30]([OH:32])=[O:31])[NH:25]2)([O-:13])=[O:12]The title compound was prepared by hydrolysis of ethyl 5-chloro-nitro-1H-indole-2-carboxylate as described for the preparation of 5,7-dichloro-1H-indole-2-carboxylic acid.
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