N-?[(1,?1-?Dimethylethoxy)?carbonyl]?-?L-?methionine 1,?1-?Dimethylethyl Ester-34S is an intermediate in synthesizing L-Methionine-34S (M260443). It is a labelled L-Methionine, an essential aminoacid for human development. Hepatoprotectant; antidote (acetominophen poisoning); urinary acidifier.