You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[4-(5-ethylpyrimidin-2-yl)piperazin-1-yl]-5-[4-(1-methyl-5-oxo-1,2,4-triazol-4-yl)phenyl]pyridine-3-carbonitrile into its molecular formula.
user
C25H25N9O
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