You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as N-(4-bromo-2-fluorophenyl)-2-[(3-ethyl-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl)sulfanyl]acetamide using the IUPAC nomenclature.
user
C20H19BrFN3O2S2
assistant