[OH-].[Na+].CO.[NH:5]1[C:9]([C:10]2[CH:11]=[C:12]([C:22]([O:24]C)=[O:23])[CH:13]=[C:14]([C:16]3[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=3)[CH:15]=2)=[N:8][N:7]=[N:6]1.Cl>O>[NH:8]1[C:9]([C:10]2[CH:11]=[C:12]([C:22]([OH:24])=[O:23])[CH:13]=[C:14]([C:16]3[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=3)[CH:15]=2)=[N:5][N:6]=[N:7]1Aqueous 2 N sodium hydroxide solution (4 mL) was added to an MeOH (40 mL) solution of methyl 5-(tetrazol-5-yl)biphenyl-3-carboxylate (1.18 g), and stirred at room temperature for 45 minutes and then at 50° C. for 5 hours. Further, aqueous 2 N sodium hydroxide solution (2 mL) was added to it, and stirred at 50° C. for 2 hours. With cooling with ice, 2 N hydrochloric acid (12 mL) and water were added to it, the formed precipitate was taken out through filtration, washed with water and dried to obtain the title compound as a white powder.
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