You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(1-oxo-2,3-dihydroinden-5-yl)-4-(thiophen-2-ylmethyl)-1,4-diazepane-1-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H23N3O2S
assistant