A carbonyl-reactive building block containing a 4-unit polyethylene glycol (PEG4) spacer arm.
An amine-reactive building block.
An amine-reactive labeling reagent with hydrophilic PEG4 spacer arm.
An amine-reactive, photocleavable labeling reagent.
An amine-reactive, non-activated reagent with hydrophilic PEG4 spacer arm.
A sulfhydryl-reactive labeling reagent containing a hydrophilic spacer arm
A maleimide-activated, building block.