GA131030: Fmoc-Thr(Galβ(1-3)(GlcNAcβ(1-6))GalNAc-OH (Peracetate)Core Glycan: Core 2 glycan is one of 4 core structures of O GalNAc glycans of mucins. The Core 2 glycan structure is an extension of Core 3 by N acetylglucosamine 1,6 branching and is catalyzed by three different core2 1,6 N acetylglucosaminyltransferase 13 (C2GnT 13).. Changes in levels of any one of these transferases may indicate celular malignancy. Core 2 O Glycan on Threonine; Fmoc Thr( D Gal(1 3)[ D GlcNAc(1 6)] D GalNAc) OH