You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methyl-1-[(3-methyl-1,2,4-oxadiazol-5-yl)methyl]-3-[[2-(morpholin-4-ylmethyl)phenyl]methyl]guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H27IN6O2
assistant