You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(1-acetylindol-3-yl)-6-chloro-1-methyl-2-oxa-5-azabicyclo[2.2.2]oct-5-en-3-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H15ClN2O3
assistant