You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[3-(3,4-dimethoxyphenyl)propyl]-1,2-dimethyl-1-[(1-methylpyrrol-2-yl)methyl]guanidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H30N4O2
assistant