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The chemistry of hemimellitic acid has been investigated. Its esters were synthesized and their structures were determined. Its anhydride and anhydride acid chloride were reduced. The homologation and reduction of some carboxyphthalides and the pyrolysis and reduction of others have been studied. Acylation of dimethyl 2-methylisophthalate and its dinitrile has been investigated and the chemistry of the resulting isocoumarin and isocarbostyril has been inspected. The conversion of the isocoumarin derivative into erythrocentaurin is presented.