You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methyl-2-(methylamino)-5-[4-(4,4,5,5,5-pentafluoropentoxy)phenyl]pentane-1,3,4-triol The above is the IUPAC name of a molecule. Write its molecular formula.
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C18H26F5NO4
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