[OH:1][C:2]1[CH:10]=[CH:9][C:8](O)=[CH:7][C:3]=1[C:4]([OH:6])=[O:5].[CH:12](O)([CH3:14])[CH3:13].S(=O)(=O)(O)O>CCCCCC>[CH:12]([O:1][C:2]1[C:3](=[CH:7][CH:8]=[CH:9][CH:10]=1)[C:4]([OH:6])=[O:5])([CH3:14])[CH3:13]210 g mixture of 2,5-dihydroxy benzoic acid and isopropanol was added to 1201 g of 80% sulfuric acid and stirred for 8 hours at 75° C. The solution was allowed to cool, and was added with 2 liters of ice water and 140 ml of hexane and was stirred in an ice bath. Resultant crystal deposit was filtrated, and the residue was washed with hexane. Then, it was dispersed in a mixture liquid consisting of methanol and water in a ratio of 6:4, and filtration was conducted. The substance was dried for 48 hours at 60° C., and 65.4 g of isopropyl-salicylic acid intermediate was obtained.
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