C([O:3][C:4](=[O:13])[C:5]1[CH:10]=[CH:9][C:8]([OH:11])=[C:7]([F:12])[CH:6]=1)C.[O:14]1[CH2:18][CH2:17][CH2:16][C@H:15]1[CH2:19]OS(C)(=O)=O>>[F:12][C:7]1[CH:6]=[C:5]([CH:10]=[CH:9][C:8]=1[O:11][CH2:19][C@@H:15]1[CH2:16][CH2:17][CH2:18][O:14]1)[C:4]([OH:3])=[O:13]According to method F, 3-fluoro-4-hydroxybenzoic acid ethyl ester was alkylated with methanesulfonic acid (S)-1-(tetrahydrofuran-2-yl)methyl ester, and the reaction product was hydrolyzed by method E. The product was thus obtained with the molecular weight of 240.23 (C12H13FO4); MS (ESI): 241 (M+H+).
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