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-[3-(5,6-dimethyl-4-oxo-3H-thieno[2,3-d]pyrimidin-2-yl)propanoyl-ethylamino]acetic acid is given. What is its corresponding molecular formula?
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C15H19N3O4S
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