[CH3:1][S:2]([C:4]1[CH:13]=[CH:12][C:11]([N:14]2[CH:18]=[N:17][N:16]=[N:15]2)=[CH:10][C:5]=1[C:6]([O:8]C)=[O:7])=[O:3].[OH-].[Na+].Cl>CO.O1CCCC1>[CH3:1][S:2]([C:4]1[CH:13]=[CH:12][C:11]([N:14]2[CH:18]=[N:17][N:16]=[N:15]2)=[CH:10][C:5]=1[C:6]([OH:8])=[O:7])=[O:3]Combine methyl 2-methylsulfinyl-5-(1H-tetrazol-1-yl)benzoate (0.46 g, 1.73 mmol) and a 1 M aqueous solution of sodium hydroxide (30 mL, 30 mmol) in methanol (10 mL) and tetrahydrofuran (10 mL). After 1 hour, adjust the pH to about 2 using a 1 M aqueous hydrochloric acid solution and extract with ethyl acetate and then dichloromethane. Dry the combined organic layers over MgSO4, filter, and concentrate in vacuo to give the title compound: Rf=0.15 (silica gel, 10% methanol/85% dichloromethane/5% acetic acid).
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