Fmoc-8-amino-3,6-dioxaoctanoic acid (Fmoc-NH-PEG2-CH2COOH) is a cleavable ADC linker used in the synthesis of antibody-drug conjugates (ADCs) and a PEG-based PROTAC linker for the synthesis of PROTACs.

EMCS (6-Maleimidohexanoic acid N-hydroxysuccinimide ester) is a heterobifunctional crosslinking agent, which is a compound for the preparation of hapten conjugate and enzyme immune conjugate, and an effective protective group in antibody drug conjugate.

Succinic anhydride is a cyclic anhydride. Succinic anhydride acts as a nonclaevable ADC linker. Succinic anhydride can react with compound 4 to link the prodrug to an amine or hydroxy 1 group of a targeting polypeptide.

Fmoc-Gly-Gly-OH, a cleavable ADC linker, can be used in the synthesis of antibody-drug conjugates (ADCs).

DSS Crosslinker is a non-cleavable ADC linker used in the synthesis of antibody-drug conjugates (ADCs). It is a homobifunctional crosslinker that is cell membrane permeable, with amine-reactive NHS esters at both ends of an 8-atom [11.4 angstrom] spacer arm for conjugating proteins, including intracellular proteins.