You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-[6-(4,4-dimethylcyclohexen-1-yl)-5-[(4-methyl-1H-pyrrole-2-carbonyl)amino]pyridin-2-yl]acetic acid by IUPAC nomenclature, provide its molecular formula.
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C21H25N3O3
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