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 6-(3,4-dihydro-2H-1,5-benzodioxepin-7-ylmethyl)-2,3-dihydroimidazo[1,2-c]quinazolin-5-one into molecular formula.
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C20H19N3O3
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