You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-[2-(carbamimidoylsulfanylmethyl)-4-fluorophenyl]sulfanyl-5-fluorophenyl]ethyl carbamimidothioate;dihydrobromide is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H20Br2F2N4S3
assistant