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 N-[6-[4-(3,4-difluoroanilino)-4-oxobutyl]sulfanylpyridazin-3-yl]cyclopropanecarboxamide is given. What is its corresponding molecular formula?
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C18H18F2N4O2S
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