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Synthetic procedures for preparing the propargyl-functionalized, photocleavable crosslinker (A) and azide-functionalized crosslinker (B). TMS = trimethylsilane, Ts = tosyl, DIPEA = diisopropyl ethyl amine, CDI = carbonyl diimidizole, DSC = disuccinimidyl carbonate. Adapted with permission (Ouyang et al., 2009; Copyright 2009, American Chemical Society).
