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 3-[(2S)-2-[(4-fluoro-3-methoxyphenyl)methyl]-5-oxopyrrolidin-2-yl]-N-[(1S)-1-thiophen-2-ylethyl]propanamide is given. What is its corresponding molecular formula?
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C21H25FN2O3S
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