You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-ethyl-2-[(2-morpholin-4-ylphenyl)methyl]-3-[(4-propan-2-yl-1,3-thiazol-2-yl)methyl]guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H32IN5OS
assistant