Pentynoic acid STP ester This is an STP (sulfotetrafluorophenyl) ester. STP esters are esters with higher hydrophilicity and water solubility than NHS. However, it performs well in pure water reactions without the addition of organic co-solvents, and is most suitable for protein modification. This water-soluble alkyne-activated ester reagent is used to attach alkyne groups to various biomolecules such as proteins and peptides. Amino-DNA and other amines can also be used.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.