You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-(4-methoxyphenyl)propyl]-N'-methyl-1,3,3a,4,5,6,7,7a-octahydroisoindole-2-carboximidamide;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H32IN3O
assistant