You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 2-fluoro-5-[(E)-3-(4-fluorophenyl)prop-2-enimidoyl]-1-N-(1-thiophen-2-ylethenyl)benzene-1,4-diamine using the IUPAC nomenclature.
user
C21H17F2N3S
assistant