You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 1-ethyl-5-fluoro-3-[5-[3-(3-methoxyazetidin-1-yl)cyclobutyl]-1,2,4-oxadiazol-3-yl]benzimidazol-2-one by IUPAC nomenclature, provide its molecular formula.
user
C19H22FN5O3
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