You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
8-bromo-N-[3-fluoro-4-(trifluoromethyl)phenyl]-4-(hydroxymethyl)spiro[3,4-dihydrochromene-2,4'-piperidine]-1'-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H21BrF4N2O3
assistant