Product Description: DBCO-PEG12-TCO cantains a TCO and a DBCO moiety. TCO group can specifically react with terrahydrazine. DBCO-PEG12-TCO is a click chemistry reagent, it contains a DBCO group that can undergo strain-promoted alkyne-azide cycloaddition (SPAAC) with molecules containing Azide groups. DBCO-PEG12-TCO also contains a TCO group that can undergo an inverse electron demand Diels-Alder reaction (iEDDA) with molecules containing Tetrazine groups.