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 7-[4-(dimethylamino)-5,6-difluoro-8-[methyl-[(2-methylpropan-2-yl)oxycarbonyl]amino]-9H-pyrido[2,3-b]indol-3-yl]-4-oxopyrido[1,2-a]pyrimidine-3-carboxylic acid is given. What is its corresponding molecular formula?
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C28H26F2N6O5
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