What is the structure of "Mellitic trianhydride" and also provide structural information ?

Mellitic trianhydride is anhydride of Mellitic acid (Benzenhexacarboxylic acid) and it's molecular formula is C₁₂O₉.

Structural information:

All carbon are Sp2 hybridized and planer and molecule have zero dipole moment.

Their are three Sp3 and six Sp2 hybridized oxygen atom.

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