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 2-amino-4-[2-(cyanomethoxy)phenyl]-7,7-dimethyl-5-oxo-6,8-dihydro-4H-chromene-3-carbonitrile into molecular formula.
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C20H19N3O3
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