m-PEG11-acid is a PEG linker containing a terminal carboxylic acid. The terminal carboxylic acid can be reacted with primary amine groups in the presence of activators (e.g. EDC, or DCC) to form a stable amide bond. The hydrophilic PEG spacer increases solubility in aqueous media.
M-PEG11-acid is a non-cleavable ADC linker containing 11-unit PEG, which can be used to synthesize antibody drug conjugates (ADC). m-PEG11-acid is also a PROTAC linker, belonging to the PEG class, which can be used to synthesize PROTAC molecules.