You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2,3-dihydro-1H-inden-5-ylsulfanyl)-N-[(1,1-dioxothiolan-3-yl)methyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H21NO3S2
assistant