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 [(2R)-2-[[cyclopropylmethyl(methyl)amino]methyl]morpholin-4-yl]-(3-ethylpyridin-4-yl)methanone is given. What is its corresponding molecular formula?
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C18H27N3O2
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