You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1R,5S)-3-(6-chloro-1H-indol-4-yl)-3,6-diazabicyclo[3.2.2]nonan-7-one by IUPAC nomenclature, provide its molecular formula.
user
C15H16ClN3O
assistant