Ald-CH2-PEG2-CH2CO2 tBu ester CAS:2230956-95-1 linker contains aldehyde and a t-butyl ester. Aldehyde readily react with hydrazide and aminooxy groups. The t-butyl ester can be de-protected under acidic conditions to form free acid. The hydrophilic PEG linker can increase the water solubility of the compound.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.