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 5-[[2-[(2S)-2-[(3E,5E)-4,6-dichlorohepta-1,3,5-trien-2-yl]piperidin-1-yl]-2-oxoacetyl]amino]-2-methoxypyridine-3-carboxamide is given. What is its corresponding molecular formula?
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C21H24Cl2N4O4
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