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 | 2,5-Dihydroxybenzoic acid |  | 2,3-Dihydroxybenzoic acid |  | 3,5-Dihydroxybenzoic acid |  | 2,4-Dihydroxybenzoic acid |  | 2,6-Dihydroxybenzoic acid |  | 3,4-Dihydroxybenzophenone |  | 2,4-Dihydroxybenzophenone |  | 4,4-Dihydroxybenzophenone |  | 3,5-Dihydroxybenzyl alcohol |  | 2,6-Dihydroxybenzaldehyde |  |  | 
      
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              | Chemical Name: | 3,4-Dihydroxybenzoic acid |  
              | Synonyms: | Protocatechuic acid |  
              | CAS#: | 99-50-3 |  
              | Molecular formula: | C7H6O4 |  
              | Molecular weight: | 154.12 |  
              | Molecular Structure: |  |  |  |