You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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2-[(3R,4S)-3-(4-chlorophenyl)-4-(hydroxymethyl)pyrrolidin-1-yl]-1-pyrrolidin-1-ylethanone is the IUPAC name of a molecule. Please give its molecular formula.
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C17H23ClN2O2
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