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 1-[4-[3-[2,4-difluoro-3-hydroxy-5-(trifluoromethyl)phenyl]-1-methylpyrazolo[3,4-d]pyrimidin-6-yl]-4,7-diazaspiro[2.5]octan-7-yl]ethanone .
user
C21H19F5N6O2
assistant