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-[(5R,6R)-6-methoxy-1-oxa-8-azaspiro[4.5]decan-8-yl]-N-(4-propan-2-ylphenyl)acetamide into molecular formula.
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C20H30N2O3
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