You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 4-[[2-(2,4-difluorophenyl)-5-methyl-1,3-oxazol-4-yl]methyl]-3,5-dihydro-2H-1,4-benzoxazepine ?
user
C20H18F2N2O2
assistant