You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[1-(3-fluoro-4-methoxyphenyl)ethyl]-2-methyl-3-[[3-(2,2,2-trifluoroethoxymethyl)phenyl]methyl]guanidine .
user
C21H25F4N3O2
assistant