tBOC-NH-PEG-SVA (t-Boc-NH-PEG-Succinimidyl Valerate), MW 5K is a bifunctional polyethylene glycol containing a valeryl succinimide functional group. Succinimidyl esters react with amino molecules in aqueous solution to form stable amide bonds. t-Boc can be deprotected using TFA and yield the free amine.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.