You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-methylprop-2-enoic acid;1,1,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,9-octadecafluorononane-1,2-diol by IUPAC nomenclature, provide its molecular formula.
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C13H8F18O4
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