You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl (1S)-1-(chloromethyl)-5-fluorosulfonyloxy-1,2-dihydrobenzo[e]indole-3-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H19ClFNO5S
assistant