t-Butyloxycarbonyl-PEG4-Sulfone-PEG4-t-butyl ester contains two PEG-acid chains connected by a sulfone group. The two carboxylic acid groups can undergo sequential amide coupling with primary/secondary amine groups using EDC, DCC or HATU activators. The PEG spacer provides additional water solubility of the compound.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.