You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[1-(2-bromophenyl)cyclopropyl]methyl]-1-(3,4-dihydro-2H-chromen-4-yl)guanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H23BrIN3O
assistant