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 1-chloro-2-(2,5-difluoro-4-nitrophenyl)-5,6,7,8-tetrahydropyrazolo[1,2-a]pyridazin-3-one;1-chloro-2-(2,5-difluorophenyl)-5,6,7,8-tetrahydropyrazolo[1,2-a]pyridazin-3-one is given. What is its corresponding molecular formula?
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C26H21Cl2F4N5O4
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