You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance ethyl 2-[[2-(4-oxo-3,6-diphenylthieno[2,3-d]pyrimidin-2-yl)sulfanylacetyl]amino]-4-thiophen-2-ylthiophene-3-carboxylate .
user
C31H23N3O4S4
assistant