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(4-tert-Butyl-2,6-dimethylphenyl)acetonitrile (Xylometazoline EP Impurity C) is an impurity of Xylometazoline (X749950), a vasoconstrictor involved in signal transduction, also used as a nasal decongestant. May be used in treatments involving ischemic injury due to the ability to shift energy metabolism from mitochondrial to glycolysis (2).