You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(2-bromophenoxy)-8-[[4-(2-fluorophenyl)piperazin-1-yl]methyl]-7-hydroxy-2-(trifluoromethyl)chromen-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H21BrF4N2O4
assistant