You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 1-[[2-(difluoromethoxy)-5-methoxyphenyl]methyl]-3-[[2-[(dimethylamino)methyl]phenyl]methyl]-2-methylguanidine ?
user
C21H28F2N4O2
assistant