You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 3,4-difluoro-N-[[4-(4-pyridin-4-yl-1H-pyrazol-5-yl)phenyl]methyl]benzenesulfonamide .
user
C21H16F2N4O2S
assistant