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poly-2,4,4,5,5,6,6-heptafluoro-2-tri-fluoromethyl-3-oxaheptane-1,7-diol formal
chem. poli-2,4,4,5,5,6,6-heptafluoro-2-tri-fluorometylo-3-oksaheptano-1,7-dioloformal n