You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(5-bromo-2-oxopyridin-1-yl)-N-[2-[2-(4-methylphenyl)-1,3-thiazol-4-yl]ethyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H18BrN3O2S
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