C[O:2][C:3](=[O:17])[C:4]1[C:9]([Cl:10])=[CH:8][C:7]([C:11]2[NH:15][N:14]=[N:13][N:12]=2)=[CH:6][C:5]=1[Cl:16].B(Br)(Br)Br>ClCCl>[Cl:16][C:5]1[CH:6]=[C:7]([C:11]2[NH:15][N:14]=[N:13][N:12]=2)[CH:8]=[C:9]([Cl:10])[C:4]=1[C:3]([OH:17])=[O:2]The mixture of 110 mg of 2,6-dichloro-4-tetrazolylbenzoic acid methylester, 0.5 ml of dichloromethane solution containing 1M BBr3 and 5 ml of dichloromethane was stirred overnight. The obtained substance was treated by an ordinary method using dichloromethane as an extractant and purified by reverse phase HPLC to obtain the title compound.
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