N3-C4-NHS ester is a noncleavable ADC linker used in the synthesis of antibody-drug conjugates (ADCs).
[1]. Pyrrolobenzodiazepine Dimer Antibody-Drug Conjugates: Synthesis and Evaluation of Noncleavable Drug-Linkers. J Med Chem. 2017 Dec 14;60(23):9490-9507.
















