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Synthesis of Ub‐conjugates: a) Synthetic scheme of 4 and 5 starting from 3. b) HPLC‐MS analysis of purified conjugate 4 (observed mass=11 473.2±0.2 Da, calcd mass=11 473 Da). c) HPLC‐MS analysis of purified conjugate 5 (observed mass=11 852.2±0.2 Da, calcd mass=11 852 Da).
