申请人:University of Northumbria at Newcastle
                            
                            
                                公开号:US20200369698A1
                            
                            
                                公开(公告)日:2020-11-26
                            
                            The present invention relates to methods of forming metal-pyridine derivative complexes using pericyclic reactions with metal-1,2,4-triazine derivative complexes and a dienophile as the reactants. The reactants are bioorthogonal and the methods are particularly useful in preparing imaging agents.