You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl N-[[(5S)-3-[4-(6,6-dioxo-1,3,3a,4,5,7,8,8a-octahydrothiepino[4,5-c]pyrrol-2-yl)-3-fluorophenyl]-2-oxo-1,3-oxazolidin-5-yl]methyl]carbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H28FN3O6S
assistant