The Collaborative International Dictionary of English v.0.48:

Eupittone \Eu*pit"tone\, n. [Pref. eu- + pittacal + -one.]
   (Chem.)
   A yellow, crystalline substance, resembling aurin, and
   obtained by the oxidation of pittacal; -- called also
   eupittonic acid. [Written also eupitton.]
   [1913 Webster]