[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH2:13][C:14]([OH:16])=O)[CH:6]=[C:7]([O:11][CH3:12])[C:8]=1[O:9][CH3:10].S(Cl)([Cl:19])=O>>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH2:13][C:14]([Cl:19])=[O:16])[CH:6]=[C:7]([O:11][CH3:12])[C:8]=1[O:9][CH3:10]In a manner similar to Preparation 15, react 3,4,5-trimethoxybenzeneacetic acid with thionyl chloride to obtain the title compound.
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