Mellitic anhydride, the anhydride of mellitic acid, is an organic compound with the formula C12O9. Mellitic anhydride is an oxide of carbon (oxocarbon), like CO2, CO, and C3O2. It is a white sublimable solid, apparently obtained by Liebig and Wöhler in 1830 in their study of mellite (`honey stone`); they assigned it the formula C4O3. The substa.....