[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[C:9]([S:10]([Cl:13])(=[O:12])=[O:11])=[C:8]([C:14](Cl)=[O:15])[S:7][C:6]=2[CH:17]=1.[CH3:18][OH:19]>C(Cl)(Cl)Cl>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[C:9]([S:10]([Cl:13])(=[O:12])=[O:11])=[C:8]([C:14]([O:19][CH3:18])=[O:15])[S:7][C:6]=2[CH:17]=1Prepared analogous to Example 1(c) from 6-chloro-2-chlorocarbonyl-benzo-[b]-thiophene-3-sulfonic acid chloride and methanol in the presence of chloroform.
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