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system
Provide the molecular formula for the IUPAC named substance 8a-[2-fluoro-5-(methylamino)phenyl]-4a,5,6,8-tetrahydro-4H-pyrano[3,4-d][1,3]thiazin-2-amine;5-(fluoromethoxy)pyridine-2-carbaldehyde .
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C21H24F2N4O3S
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