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system
Provide the molecular formula for the IUPAC named substance 2-N,3-N-dimethyl-4-[2,3,5,6-tetrafluoro-4-(2,3,6-trifluoro-4,5-dimethylphenyl)phenyl]sulfanylbut-1-ene-2,3-diamine .
user
C20H19F7N2S
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