You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[1-(3-chlorophenyl)cyclopropyl]methyl]-1-(1,4-diazabicyclo[2.2.2]octan-2-ylmethyl)-3-ethylguanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H31ClIN5
assistant