You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[2-(difluoromethoxy)phenyl]methyl]-1-ethyl-3-[2-morpholin-4-yl-2-(oxolan-3-yl)ethyl]guanidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H32F2N4O3
assistant