You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-(1,1,1,3,3,3-hexafluoro-2-hydroxypropan-2-yl)phenyl]-N-methyladamantane-1-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H23F6NO2
assistant