You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[4,5-bis(4-methoxyphenyl)-1H-imidazol-2-yl]sulfanyl]-N-(2,3,5,6-tetrafluorophenyl)butanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H23F4N3O3S
assistant