Synthesis of [1

131213 1234 5 14 214 The present invention is directed to labeled compounds, of the formulae wherein C* is each independently selected from the group consisting of C and C with the proviso that at least one C* is C, each hydrogen of the methylene group can independently be either hydrogen or deuterium, the methyl group includes either zero or three deuterium atoms, Q is from the group of sulfide, sulfinyl, and sulfone, Z is an aryl group from the group of 1-naphthyl, substituted 1-naphthyl, 2-naphthyl, substituted 2-naphthyl, and phenyl groups with the structure wherein R, R, R, Rand Rare each independently from the group of hydrogen, a C-Clower alkyl, a halogen, and an amino group from the group of NH, NHR and NRR′ where R and R′ are each independently from the group of a C-Clower alkyl, a phenyl, and an alkoxy group, and the methyl group can include either zero or three deuterium atoms.