trimellitic anhydride
"A 2-benzofuran compound having oxo groups at the 1- and 3-positions and a carboxy substituent at the 5-position; the cyclic anhydride formed from the carboxy groups at the 1- and 2-positions of trimellitic acid."
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03. Biological Effects of Specific Chemicals: hapten [CHEBI:59174] > trimellitic anhydride [CHEBI:53050]