Using [Cl-], COc1ccc(-n2nc(N)cc2-c2ccc(OCCNC(N)=O)cc2)cc1 to produce COc1ccc(-n2nc(Cl)cc2-c2ccc(OCCNC(N)=O)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.