You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(1-butan-2-yl-5-methylpyrazol-3-yl)-2-(1,3,5-trimethylpyrazol-4-yl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H25N5O
assistant