You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (1S)-1-(2-fluorophenyl)-N-[(3R)-1-(4-methylphenyl)-5-oxopyrrolidin-3-yl]-3,4-dihydro-1H-pyrrolo[1,2-a]pyrazine-2-carboxamide into molecular formula.
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C25H25FN4O2
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