You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-(3,4-dimethylphenyl)-4-oxopyrazolo[1,5-d][1,2,4]triazin-5-yl]-N-(2-phenylethyl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H23N5O2
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