3,6,6-trimethyl-4-oxo-5,6,7-trihydrobenzo[1,2-b]furan-2-carboxylic acid;3,6,6-trimethyl-4-oxo-4,5,6,7-tetrahydro-1-benzofuran-2-carboxylic acid;3,6,6-Trimethyl-4-oxo-4,5,6,7-tetrahydro-benzofuran-2-carboxylic acid
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