You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-cyclopentyl-3-ethyl-2-[[3-(4-methoxyphenyl)-1H-1,2,4-triazol-5-yl]methyl]guanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H27IN6O
assistant