Azido-PEG4-Val-Cit-PAB-PNP produced by AXISPHARM is a cleavable ADC linker, a drug-linker conjugate for ADC, Azido-PEG4-Val-Cit linker-PAB-O, it Contains an azido-PEG4 spacer, a protease-sensitive Val-Cit dipeptide, a PAB linker payload is also a PEG-based PROTAC linker for PROTAC synthesis. And PNP is a good leaving group.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.