You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-oxo-2-(thiophene-2-carbonylamino)ethyl] 2-thieno[2,3-d]pyrimidin-4-ylsulfanylacetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H11N3O4S3
assistant