You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(3-cyclopentyloxypropyl)-2-methyl-3-[(2-oxo-3,4-dihydro-1H-quinolin-4-yl)methyl]guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H31IN4O2
assistant