N-[(1,1-Dimethylethoxy)carbonyl]-S-[(3S)-4-(1,1-dimethylethoxy)-3-[[(1,1-dimethylethoxy)carbonyl]amino]-4-oxobutyl]-L-homocysteine 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.