Methyltetrazine-DBCO CAS:1802238-48-7 bears a TCO and a DBCO group. This linker can be used sequentially to conjugate an azide-bearing biomolecule onto a TCO -tagged peptides or proteins.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.