You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-tert-butyl-N-[2-(3-methylpyrazin-2-yl)ethyl]-5-(trifluoromethyl)pyrazole-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H20F3N5O
assistant