You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[(3-chlorophenyl)methyl]-5-[(4-methylsulfonylmorpholin-2-yl)methoxymethyl]-4-oxo-3H-thieno[2,3-d]pyrimidine-2-carboxamide into its molecular formula.
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C21H23ClN4O6S2
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