You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1,6-dimethyl-N-[3-methyl-1-(2-methyl-1,2,4-triazol-3-yl)butyl]-4-oxopyridine-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H23N5O2
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