You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (E)-1-[4-(3-chloro-4-fluoroanilino)-7-ethoxyquinazolin-6-yl]-5-[4-hydroxybutyl(methyl)amino]pent-3-en-2-one by IUPAC nomenclature, provide its molecular formula.
user
C26H30ClFN4O3
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