4,4,5,5-Tetramethyl-2-[4-(2,2,2-trifluoroethyl)phenyl]-1,3,2-dioxaborolane-d4 is labelled 4,4,5,5-Tetramethyl-2-[4-(2,2,2-trifluoroethyl)phenyl]-1,3,2-dioxaborolane (T305500) which is an intermediate used to prepare fused imidazolone derivatives as possible allosteric modulators for metabotropic glutamate receptor subtype 2 (mGlu2 receptor).