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 1-methyl-1-[(3R)-2-oxo-1-prop-2-enylpyrrolidin-3-yl]-3-spiro[1,3-benzodioxole-2,1'-cyclopentane]-5-ylurea into molecular formula.
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C20H25N3O4
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