Axispharm offers you high purity Hydroxyl PEG Succinimidyl Carboxymethyl Ester (HO PEG SCM), MW 3.5K is a heterobifunctional hydroxy PEG succinimide used as a crosslinker or as a spacer between two different chemical entities Carboxymethyl ester products.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.