You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-[2-(2-chloro-4-fluorophenyl)-2-methylpropyl]-3-[[4-(dimethylamino)oxan-4-yl]methyl]-2-methylguanidine .
user
C20H32ClFN4O
assistant