You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(2-amino-4-thiophen-2-yl-1,3-thiazol-5-yl)-N-[2-(1H-indol-3-yl)ethyl]propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H20N4OS2
assistant