You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 1-[(2-ethoxyphenyl)methyl]-3-ethyl-2-[[4-fluoro-3-(methoxymethyl)phenyl]methyl]guanidine using the IUPAC nomenclature.
user
C21H28FN3O2
assistant