You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(2R)-1-(ethylamino)-1-oxopropan-2-yl] 2-[5-(4-fluorophenyl)-4-oxothieno[2,3-d]pyrimidin-3-yl]acetate by IUPAC nomenclature, provide its molecular formula.
user