Fundamental unit of the tocopherols; 6-phytylhydroquinone is in equilibrium with, in the chromanol form, 2-methyl-2-(4,8,12-trimethyltridecyl)chroman-6-ol.
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to·col (toґkol) the basic unit of the tocopherols and tocotrienols, hydroquinone with a saturated polyisoprenoid side chain at the 6 position; it is an antioxidant.Medical dictionary. 2011.