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Name the molecular formula for the molecule established as 2-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-3-fluoro-5-[2-(5-methyl-1,3,4-thiadiazol-2-yl)ethynyl]benzaldehyde using the IUPAC nomenclature.
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C18H18FN3O2S
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