2-benzofuran-1,3-dionewater⟶benzene-1,2-dicarboxylic acidReverse reactionsbenzene-1,2-dicarboxylic acid → 2-benzofuran-1,3-dione + waterPotentially competingbenzene-1,2-dicarboxylic acid → 2-benzofuran-1,3-dione + waterLessonsReactions of Acid Anhydrides