Tri-GalNAc-DBCO enables the possibility to click label an azide modified target with an Tri-GalNAc by strain-promoted Alkyne-Azide cycloaddition (SPAAC). The Tri-GalNAc structure is recognized by the desialic acid glycoprotein receptor (ASGPR) and can be therefore used to target delivery of biomolecules as siRNA to liver tissue.