You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(1-methyl-4-oxo-3-propan-2-ylpyrazolo[3,4-d]pyridazin-5-yl)-N-[1-(4-methylphenyl)ethyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H25N5O2
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