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Chemical structures of the enfuvirtide-CP conjugates. Compounds EP40114, EP40111, EP40112, and EP40113 correspond to enfuvirtide-PEGn-CP with 4, 12, 28, and 70 (labeled n) ethylene glycol units (i.e., PEG), respectively. Enfuvirtide is connected to the PEG linker through its N terminus. The C terminus (Cter) of enfuvirtide is a carboxamide, CONH2.
