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a) Retrosynthesis of IL‐6 glycoforms; b) N‐glycans detected in natural human IL‐6 (values in parentheses give percentage of total N‐glycans and were deduced from ref. [2]); c) structures of N‐glycans envisioned for systematically varied library of hIL‐6 glycoforms. The IL‐6 glycoforms marked in bold (Gn and G2) were available from previous work. [5]
