[OH:1][C:2]1[C:15]2[C:14](=[O:16])[C:13]3[C:8](=[C:9]([O:17][CH3:18])[CH:10]=[CH:11][CH:12]=3)[O:7][C:6]=2[CH:5]=[C:4]([OH:19])[CH:3]=1.C([O-])([O-])=O.[K+].[K+].[CH2:26]([CH:28]1[O:30][CH2:29]1)Cl>CC(C)=O>[OH:1][C:2]1[C:15]2[C:14](=[O:16])[C:13]3[C:8](=[C:9]([O:17][CH3:18])[CH:10]=[CH:11][CH:12]=3)[O:7][C:6]=2[CH:5]=[C:4]([O:19][CH2:26][CH:28]2[CH2:29][O:30]2)[CH:3]=1A mixture of 1,3-dihydroxy-5-methoxy-9H-xanthen-9-one (1.13 g, 4.39 mmol) prepared in Step 1 of Example 1 and K2CO3 (1.52 g, 10.98 mmol) in anhydrous acetone (25 mL) was charged to a dry round-bottom flask, and epichlorohydrin (1.73 mL, 21.95 mmol) was added thereto, followed by stirring under reflux at a temperature of 55 to 60° C. for 6 hours. Solid of the reaction mixture was filtered, and the solvent was removed under reduced pressure. The resulting residue was separated and purified by silica gel column chromatography (developing solvent: ethyl acetate:n-hexane=1:1 (v/v)) to give the title compound (443.2 mg, 32%) as a light yellow solid.
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