You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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4-(6,7-dichloro-1,1-dioxo-4H-1lambda6,2,4-benzothiadiazin-3-yl)butanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
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C11H10Cl2N2O4S
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