You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(5-bromopyridin-2-yl)-2-[(4-butyl-5-oxo-1H-1,2,4-triazol-3-yl)sulfanyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H16BrN5O2S
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