(CH3)2.C6H3.OH

from The Collaborative International Dictionary of English v.0.48

Xylenol \Xy"le*nol\, n. [Xylene + -ol.] (Chem.)
   Any one of six metameric phenol derivatives of xylene,
   obtained as crystalline substances, {(CH3)2.C6H3.OH}.
   [1913 Webster]