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 1-cyano-3-pyridin-4-yl-2-[[4-[4-(trifluoromethyl)phenyl]sulfonylphenyl]methyl]guanidine .
user
C21H16F3N5O2S
assistant