2-(4-(tert-butyl)-3-hydroxy-2,6-dimethylphenyl)acetic acid|4-(1,1-Dimethylethyl)-3-hydroxy-2,6-dimethylbenzethyl-3-hydroxyphenylacetic Acid;|4-tert-Butyl-2,6-dimethyl-3-hydroxyphenylacetic Acid;|Oxymetazoline BP Impurity D ; 2-[4-(1,1-Dimethylethyl)-3-hydroxy-2,6-dimethylphenyl]acetic acid ;