You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2,4-difluorophenyl)-2-[[3-(4-nitrophenyl)-4-oxo-5H-pyrimido[5,4-b]indol-2-yl]sulfanyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C24H15F2N5O4S
assistant