You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-[(4,5-dichloro-1-methylpyrrol-2-yl)methyl]-2-methyl-3-(2-thiophen-2-ylpropyl)guanidine .
user
C15H20Cl2N4S
assistant