Hexahydroxybenzene triscarbonate is a chemical compound, an oxide of carbon with formula C9O9.

Its molecular structure consists of a benzene core with the six hydrogen atoms replaced by three carbonate groups.

It can be seen as a sixfold ester of hexahydroxybenzene (benzenehexol) and carbonic acid.

The compound was obtained by C. Nallaiah in 1984, as a tetrahydrofuran solvate.

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