Tetrazine-C5-NHS ester is a heterobifunctional linker. It features a tetrazine group for inverse electron demand Diels-Alder reactions. Paired with an activated NHS ester, it reacts with strained alkenes like trans-cyclooctene and norbornene. The result is a stable dihydropyridazine linkage.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.