You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(1-acetyl-2,3-dihydroindol-5-yl)-5-(cyclopropanecarbonylamino)-3-methylthiophene-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H21N3O3S
assistant