You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[methyl-[2-oxo-2-(1,2,5-trimethylpyrrol-3-yl)ethyl]amino]-N-(4-methylphenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H25N3O2
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