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Chemical structures of oligo(polyethylene glycol) fumarate (OPF), sodium methacrylate (SMA), and doxorubicin HCL (DOX). The OPF (a), composed of repeating PEG and fumarate chains, was crosslinked with SMA (b) in the presence of the photoinitiator Irgacure 2959 and ultraviolet light to form negatively charged hydrogels. DOX (c) was loaded into negatively charged hydrogels containing SMA by electrostatic interaction.
