You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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N-[(4-fluorophenyl)methyl]-6-methyl-5-[(4-methylphenyl)methyl]-4-oxo-2-thiophen-2-yl-7H-pyrazolo[1,5-a]pyrazine-6-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
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C27H25FN4O2S
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