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-[7-(2-chlorophenyl)-1,3-dimethyl-2,4-dioxopyrimido[4,5-d]pyrimidin-5-yl]sulfanylacetonitrile is given. What is its corresponding molecular formula?
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C16H12ClN5O2S
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