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 [(4S,7R,8R)-7-hydroxy-4-oxido-5,6,7,8-tetrahydro-3H-pyrrolizin-4-ium-1-yl]methyl (2R)-2-[(1S)-1-acetyloxyethyl]-2-hydroxy-3-methylbutanoate is given. What is its corresponding molecular formula?
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C17H27NO7
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