Amine-PEG-valeric Acid, MW 3.4K is a bifunctional modified PEG containing free amine and terminal carboxylic acid. Valeric acid is a linear alkyl carboxylic acid that, like other low molecular weight carboxylic acids, has a very unpleasant odor.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.