You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named [4-(2,3-dimethylphenyl)piperazin-1-yl]-(4,5,6,7-tetrahydro-1H-indazol-4-yl)methanone is given. What is its corresponding molecular formula?
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C20H26N4O
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