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-[1-(2,5-dimethoxyphenyl)ethyl]-3-[(5-ethyl-1,3-thiazol-2-yl)methyl]-2-methylguanidine .
user
C18H26N4O2S
assistant