Patent ID: 8802738

Claim:
A polymer network comprising the following monomer subunits: and further comprising at least one of the following monomer subunits: wherein R 1 is a group comprising a zwitterionic moiety selected from sulfobetaine and phosphorylcholine; R 2 , R 3 , R 4 , R 5 , R 6 each is independently selected from the group consisting of hydrogen and (C 1 -C 15 ) alkyl; a each is 0, 1, 2, or 3; b each is, 1, 2, 3, 4, 5, or 6; A is selected from camptothecin, irinotecin, SN-38, and derivatives thereof; and each of L 1 ′, L 2 ′ and L 3 ′ is independently a linker group linked to A or R 1 , wherein at least one of L 1 ′, L 2 ′ and L 3 ′ comprises wherein the polymer network is crosslinked.