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PROCEEDINGS OF THE AMERICAN ACADEMY 



HOS0 2 C = C - COOH 

 \ 



O 

 / 

 HC = CBr. 



In aDy case, the aa-dibromfurfuran-/3-sulpbonic acid formed from it by 

 the actioD of bromine has the structure 



HOS0. 2 C = CBr 



\ 



O 

 / 

 HC = CBr. 



