You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-methoxyethyl (6S)-6-[3-(difluoromethoxy)-4-methoxyphenyl]-3,4-dimethyl-2-oxo-1,6-dihydropyrimidine-5-carboxylate into its molecular formula.
user
C18H22F2N2O6
assistant