3-Methyldisulfanylpropionic acid 2,5-dioxopyrrolidin-1-yl ester

1-[3-(Methyldithio)-1-oxopropoxy]-2,5-pyrrolidinedione is an intermediate used in the synthesis of Mertansine-13CD3 (M257802), which is the isotope labelled analog of Mertansine (M257800); a cytotoxic agent used as the cytotoxic component in antibody-drug conjugates.