You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(3,4-dihydro-2H-chromen-4-yl)-1-[1-(4-methylsulfinylphenyl)ethyl]guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H24IN3O2S
assistant