The present invention relates to a process for the preparation of a hydrogel-linked prodrug releasing a tag moiety-biologically active moiety conjugate, to a hydrogel-linked prodrug releasing a tag moiety-bio logically active moiety conjugate obtainable by such process, to pharmaceutical compositions comprising said prodrug and their use as a medicament.
Walter,W.; Bode,K.-D., Justus Liebigs Annalen der Chemie, 1965, vol. 681, p. 64 - 84