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 4-amino-1-[(2R,3S,4S,5R)-3-ethyl-5-ethynyl-4-hydroxy-5-(hydroxymethyl)oxolan-2-yl]pyrimidin-2-one is given. What is its corresponding molecular formula?
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C13H17N3O4
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