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 4-(6,7-dimethoxy-4-oxoquinazolin-3-yl)-N-(4-methoxy-1,3-benzothiazol-2-yl)butanamide is given. What is its corresponding molecular formula?
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C22H22N4O5S
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