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 2-amino-4-(5-bromothiophen-2-yl)-1-(4-fluorophenyl)-5-oxo-4,6,7,8-tetrahydroquinoline-3-carbonitrile .
user
C20H15BrFN3OS
assistant