c4h3o2c2o2

from The Collaborative International Dictionary of English v.0.48
Furile \Fu"rile\, n. [Furfurol + benzile.] (Chem.)
   A yellow, crystalline substance, {(C4H3O)2.C2O2}, obtained by
   the oxidation of furoin. [Written also {furil}.]
   [1913 Webster]
    

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