You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule tert-butyl (4aR,10bR)-9-bromo-5,5-dimethylspiro[2,4,4a,10b-tetrahydropyrano[3,2-c]chromene-3,4'-piperidine]-1'-carboxylate .
user
C23H32BrNO4
assistant