You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-methoxyethyl (6R)-6-(2-chloro-6-fluorophenyl)-3-cyclopropyl-4-methyl-2-sulfanylidene-1,6-dihydropyrimidine-5-carboxylate .
user
C18H20ClFN2O3S
assistant