You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(3-bromo-4-methoxyphenyl)-N-[2-(4-methoxy-2-methyl-6-oxopyridin-1-yl)ethyl]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
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C19H23BrN2O4
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