You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 5-fluoro-2-methyl-N-[[(Z)-2-(methylamino)-2-[4-(propylamino)phenyl]ethenyl]sulfanylmethyl]aniline into molecular formula.
user
C20H26FN3S
assistant