You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-(1H-imidazol-5-yl)propyl]-1-[2-[N-(thiophen-2-ylmethyl)anilino]ethyl]guanidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H26N6S
assistant