You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
15-chloro-1'-(2-pyridin-3-ylacetyl)spiro[2-oxa-11-azabicyclo[11.4.0]heptadeca-1(13),14,16-triene-9,4'-piperidine]-12-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H32ClN3O3
assistant