You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 3-(2,3-dihydro-1H-indol-7-ylmethyl)-6,7,8-trimethoxy-1,2,4,5-tetrahydro-3-benzazepine into molecular formula.
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C22H28N2O3
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