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-[2-[[(1R)-1-(4-oxo-5-thiophen-2-yl-3H-thieno[2,3-d]pyrimidin-2-yl)ethyl]amino]ethyl]acetamide using the IUPAC nomenclature.
user
C16H18N4O2S2
assistant