You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R)-1-(ethylamino)-1-oxopropan-2-yl] 2-[5-(4-fluorophenyl)-4-oxothieno[2,3-d]pyrimidin-3-yl]acetate is the IUPAC name of a molecule. Please give its SMILES representation.
user