You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[(3S,4R,5R,6R)-3-[acetyl(methyl)amino]-1-ethyl-4,5,6-trihydroxyazepan-3-yl]acetamide into molecular formula.
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C13H25N3O5
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