You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-(3,4-dimethoxyphenyl)-2-methylpropyl]-2-methyl-3-[(3-propan-2-yl-1,2-oxazol-5-yl)methyl]guanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H33IN4O3
assistant