You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (2-morpholin-4-yl-2-oxo-1-phenylethyl) 2-thieno[2,3-d]pyrimidin-4-ylsulfanylacetate is given. What is its corresponding molecular formula?
user
C20H19N3O4S2
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