You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[[4-(2-methoxyethoxy)phenyl]methyl]-2-methyl-3-[[4-(2,2,2-trifluoroethoxy)phenyl]methyl]guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H27F3IN3O3
assistant