You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 5-chloro-2-[(E)-3-[(3S)-4-[(4-fluorophenyl)methyl]-3-methylpiperazin-1-yl]-3-iminoprop-1-enyl]aniline .
user
C21H24ClFN4
assistant