4-Arm PEG-Hydrazide (4-arm PEG-HZ), MW 2K is a multi-armed PEG derivative with hydrazides (CONHNH2) at each end, which can react with ketones or aldehydes to form acyl hydrazone linkers, Hydrazine PEG Also used for pegylation of carboxyl, carboxylic acid groups.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.