N2-[(1,1-Dimethylethoxy)carbonyl]-N6-[(phenylmethoxy)carbonyl]-L-lysine Methyl Ester is an intermediate in synthesizing Nε-(1-Carboxymethyl)-L-lysine (C180075), CEL and CML are two stable, nonenzymatic chemical modifications of protein lysine residues resulting from glycation and oxidation reactions.