You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-(3-fluorophenyl)-2-[4-[2-[[(4-fluorophenyl)-thiophen-2-ylmethyl]amino]acetyl]piperazin-1-yl]acetamide into its molecular formula.
user
C25H26F2N4O2S
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