Fmoc-N-methyl-PEG3-CH2CH2COOH is a cleavable ADC linker utilized in the synthesis of antibody-drug conjugates (ADCs) [1].

N3-PEG4-C2-Pfp ester is a four-unit polyethylene glycol linker, noncleavable in nature, specifically employed in the fabrication of antibody-drug conjugates (ADCs).

Azido-PEG6-NHS ester is a cleavable 6 unit polyethylene glycol (PEG) linker, commonly employed in the synthesis of antibody-drug conjugates (ADCs)[1]. Additionally, it serves as a PEG- and alkyl/ether based linker for the synthesis of proteolysis targeting chimeras (PROTACs)[2].

Mal-PEG1-acid is a non-cleavable (1 unit PEG) ADC linker used in the synthesis of antibody-drug conjugates (ADCs)

DBCO-NHS ester 3 (Compound 12) is a cleavable linker utilized in the synthesis of antibody-drug conjugate (ADC). It is a derivative of Dibenzylcyclooctyne (DBCO) resulting from the activation of N-hydroxysuccinimide by the carboxylic acid moiety of both methyl-oxanorbornadiene (MeOND) and dibenzoazacyclooctyne (DIBAC)[1][2].

Propargyl-PEG2-acid is a non-cleavable 2-unit PEG ADC linker used in synthesizing antibody-drug conjugates (ADCs)[1].

(2-Pyridyldithio)-PEG4 acid is a four-unit cleavable polyethylene glycol (PEG) linker specifically designed for the synthesis of antibody-drug conjugates (ADCs)[1]. It serves as a crucial component in the conjugation of antibodies and drugs, enabling targeted drug delivery and enhanced therapeutic efficacy. This linker possesses a (2-pyridyldithio) group at one end, facilitating the attachment of the linker to the specific site on the antibody molecule. The PEG4 chain provides the necessary flexibility and biocompatibility for optimal drug release while maintaining stability throughout the circulation in the body. Ultimately, (2-Pyridyldithio)-PEG4 acid is instrumental in the development and advancement of ADCs, a promising approach in cancer therapy.

Propargyl-PEG4-CH2CO2-NHS is a PEG derivative containing a propargyl group and an NHS group. The hydrophilic PEG spacer increases solubility in aqueous media.

MC-AAA-NHCH2OCH2COOH (compound 20) is a cleavable antibody-drug conjugate (ADC) linker. Its primary application lies in the synthesis of ADCs.