Aniline-13C6 is a building block.1,2 It has been used in the synthesis of 13C6-labeled derivatives of tryptophan and indole, as well as 13C6-labeled benzimidazoles.
1.Ili?, N., and Cohen, J.D.Synthesis of [13C]-isotopomers of indole and tryptophan for use in the analysis of indole-3-acetic acid biosynthesisJ. Label. Compd. Radiopharm.47(10)635-646(2004) 2.Donahue, M.G., Jentsch, N.G., and Simons, C.R.Synthesis of [13C6]3,4-diaminobenzoic acid as a precursor for stable isotope labeled benzimidazolesTetrahedron Lett.58(17)1692-1694(2017)