You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 1'-(2-chlorobenzoyl)spiro[2-oxa-11-azabicyclo[11.4.0]heptadeca-1(17),13,15-triene-9,3'-piperidine]-12-one ?
user
C26H31ClN2O3
assistant