You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[4-[1-[(2,6-difluorophenyl)methyl]-5-[[methyl-[(2-methylphenyl)methyl]amino]methyl]-2,4-dioxo-3-phenylthieno[2,3-d]pyrimidin-6-yl]phenyl]-1,1-dimethylurea;ethane is the IUPAC name of a molecule. Please give its molecular formula.
user
C40H41F2N5O3S
assistant