A composition which includes oxyntomodulin and polyethylene glycol polymer (PEG polymer) linked via a reversible linker such as 9-fluorenylmethoxycarbonyl (Fmoc) or 2-sulfo-9-fluorenylmethoxycarbonyl (FMS) is disclosed. Pharmaceutical compositions comprising the reverse pegylated oxyntomodulin and methods of using same are also disclosed.<；p>；La solicitud describe conjugados que aumentan la vida media bioló；gica de la proteí；na oxintomodulina, mediante la adició；n de los enlazadores 9-FLUORENILMETOXICARBONILO O 2-SULFO-9-FLUORENILMETOXICARBONILO.<；/p>；
