You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 2-methyl-1-[(3-methylphenyl)methyl]-3-(2-morpholin-4-yl-2-thiophen-2-ylethyl)guanidine using the IUPAC nomenclature.
user
C20H28N4OS
assistant