The present invention relates to a prodrug or a pharmaceutically acceptable salt thereof comprising an GLP-1/Glucagon agonist linker conjugate Z - L1 –L2 - L - Y - R20, wherein Y represents an GLP-1/Glucagon agonist moiety； and -L is a linker moiety - by formula (Ia), wherein the dashed line indicates the attachment to one of the amino groups of the GLP-1/Glucagon agonist moiety by forming an amide bond. The invention further relates to pharmaceutical compositions comprising said prodrugs as well as their use as a medicament for treating or preventing diseases or disorders which can be treated by GLP-1/Glucagon agonist.
