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 (2S)-2-[(2-fluorophenyl)sulfonylamino]-N-[3-[(4-methylpiperazin-1-yl)methyl]phenyl]propanamide .
user
C21H27FN4O3S
assistant