You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 6,6-dimethyl-4-[(1R,2R)-2-[2-(trifluoromethyl)phenyl]cyclopropanecarbonyl]morpholine-2-carboxylic acid into its molecular formula.
user
C18H20F3NO4
assistant