Disialylated Core 1 O-glycan (C1S(3,6)2), 2-AB labeled is a disialylated, 2-AB (2-aminobenzamide) labeled O-linked glycan with core structure 1 (MUC1-M). Disialylated Core 1 O-glycan (C1S(3,6)2), 2-AB labeled is related to sialylation and participates in life activities including cell recognition, protection, immune regulation and disease markers.