Folate-PEG-Thiol (FA-PEG-SH), MW 5K is a maleimide reactive polyPEG. Folic acid, or vitamin B9, selectively binds to folate receptors, while thiol-reactive thiol (SH) can be used to react with maleimide or thiol groups.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.