You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-ethyl-1-[(4-ethylphenyl)methyl]-1-methyl-2-[(4-methylmorpholin-2-yl)methyl]guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H33IN4O
assistant