Pharmaceutical formulations and pharmaceutical compositions comprising reverse PEGylated oxyntomodulin conjugates, and methods of producing, and using the same are described. Conjugates include those attaching a polyethylene glycol polymer (PEG polymer) and 9-fluorenylmethoxycarbonyl (Fmoc) or 2-sulfo-9- fluorenylmethoxycarbonyl (FMS) to a oxyntomodulin peptide, wherein the PEG polymer is attached to the amino terminus or to an amino residue within the oxyntomodulin via a flexible linker, wherein the flexible linker comprises a Fmoc or a FMS.描述包括可逆聚乙二醇化調酸素結合物之醫藥調配物及醫藥組合物,以及其產生及使用方法。結合物包含將聚乙二醇聚合物(PEG聚合物)及9-茀基甲氧基羰基(Fmoc)或2-磺酸基-9-茀基甲氧基羰基(FMS)附接於調酸素肽之結合物,其中PEG聚合物經由可撓性連接子附接於胺基端或調酸素內之胺基殘基,其中可撓性連接子包括Fmoc或FMS。