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 3-[(6E)-6-(1,3-benzodioxol-5-ylmethylidene)-5-oxo-[1,3]thiazolo[2,3-c][1,2,4]triazol-3-yl]-N-(2,5-dichlorophenyl)propanamide is given. What is its corresponding molecular formula?
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C21H14Cl2N4O4S
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