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 4-[4-(hydroxymethyl)-2-(2-methylpropyl)-2,8-diazaspiro[4.5]decan-8-yl]-2-(trifluoromethyl)benzonitrile ?
user
C21H28F3N3O
assistant