Spectra ( Help ). From Wikipedia Bis(2-ethylhexyl) phthalate ( di-2-ethylhexyl phthalate , DEHP ; dioctyl phthalate , DOP ), is an organic compound with the formula C 6 H 4 (C 8 H 17 COO) 2 . This compound is the most common of the class of phthalate plasticizers. It is