ZINC77292789 (Fmoc-Thr[GalNAc(Ac)3-α-D]-OH) is a reagent for the preparation of a synthetic MUC1 Glycopeptide Bearing βGalNAc-Thr as a Tn antigen isomer which induces the antibody production against tumor cells. ZINC77292789 is a starting material to make trimeric MUC1 immunodominant motif antigen-based anti-cancer vaccine candidates.