Azido-PEG4-Trimannose enables the possibility to click label an Alkyne or DBCO modified target with an 3,6-di-O-(α-D-mannopyranosyl)-α-D-mannopyranoside moity by CuAAC. The Trimannose structure is recognized by the mannose receptor and leads to transportation into the cell by internalized receptor mediated endocytosis. Therefore this molecule offers a possibility for target delivery of biomolecules to the cell.