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 (1R,3R,8S)-3-phenyl-N-(1H-1,2,4-triazol-5-ylmethyl)-2,3,5,6,7,8-hexahydro-1H-pyrrolizine-1-carboxamide is given. What is its corresponding molecular formula?
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C17H21N5O
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