You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 4-[3-(4-fluorophenyl)-1,2,4-oxadiazol-5-yl]-N-[(1R)-1-(4-methoxyphenyl)-2-(4-methylpiperazin-1-yl)ethyl]butanamide by IUPAC nomenclature, provide its molecular formula.
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C26H32FN5O3
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