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

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].

MC-Val-Cit-PAB 是一种组织蛋白酶可裂解的 ADC 接头，用于制备抗体-药物偶联物。

20-(tert-Butoxy)-20-oxoicosanoic acid 可以作为 ADC linker 或 PROTAC linker，用于合成抗体偶联药物或合成 PROTAC。

N-Boc-cis-4-hydroxy-L-proline methyl ester为不可降解(non-cleavable)的ADC linker，用于抗体药物偶联体(ADCs)合成。该化合物同时作为基于烷基链(alkyl chain)的PROTAC linker，适用于PROTAC合成。