You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-oxo-4-[4-pyrazol-1-yl-2-(trifluoromethyl)anilino]butyl]thiophene-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H17F3N4O2S
assistant