You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(3-bromophenyl)-1-(4-fluorophenyl)-3-methyl-4,8-dihydropyrazolo[3,4-e][1,4]thiazepin-7-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H15BrFN3OS
assistant