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Inter- and intra-molecular hydrogen-bonded trifluoromethylated alcohols: X-ray crystal structures of 2,5-bis(trifluoromethyl)hexane-2,5-diol, 1,1,1,4,4,4-hexafluoro-2-(3,4-methylenedioxyphenyl)butane-2,3-diol, and 1,1,1-trifluoro-2-oxo-3-(3,4-methylenedio