m-PEG4-CH2-aldehyde is a aldehyde linker that is reactive to hydrazide and aminooxy groups for labeling and crosslinking.
m-PEG4-CH2-aldehyde is a PEG-based based PROTAC linker can be used in the synthesis of PROTACs.
[1] Jennifer Riggs-Sauthier, et al. Oligomer-protease inhibitor conjugates. WO2008112289A2.