You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 1-[(2-chloropyridin-4-yl)methylcarbamoyl]-5-(trifluoromethoxy)spiro[2H-indole-3,4'-piperidine]-1'-carboxylic acid ?
user
C21H20ClF3N4O4
assistant