You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(7'-chlorospiro[piperidine-4,4'-pyrrolo[2,1-c][1,4]benzoxazine]-1'-yl)-[2-(trifluoromethoxy)phenyl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H18ClF3N2O3
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