JQ-1 (carboxylic acid)-NH-C8-COOH is a synthetic target protein ligand-linker conjugate used in the synthesis of JQ1-S(GlcNAc)Cq. JQ1-S(GlcNAc)Cq is a potent enzyme-activated glycosylation (Sugar-CoatedPROTAC) bifunctional degrader with antitumor activity.