You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 2-ethyl-7-[(3R)-3-[(3-methoxyphenoxy)methyl]piperidin-1-yl]-[1,3]oxazolo[5,4-d]pyrimidine is given. What is its corresponding molecular formula?
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C20H24N4O3
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