Benzenetricarboxylic acid is a group of chemical compounds which are tricarboxylic derivatives of benzene. Benzenetricarboxylic acid comes in three isomers:
| Common Name | Hemimellitic acid | Trimellitic acid | Trimesic acid |
| Systematic Name | 1,2,3-benzenetricarboxylic acid | 1,2,4-benzenetricarboxylic acid | 1,3,5-benzenetricarboxylic acid |
| Structural Formula |  |
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| CAS Registry Number | 732304-21-1 | 528-44-9 | 554-95-0 |
All isomers share the molecular weight 210.14 g/mol and the chemical formula C9H6O6.
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