You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R)-1-[[3-tert-butyl-5-(trifluoromethyl)phenyl]methyl]-N,N-dimethylpyrrolidin-3-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H27F3N2
assistant