Using COc1cccc(Nc2c(C(N)=O)cnc3ccc(I)cc23)c1 to produce COc1cccc(Nc2c(C(N)=O)cnc3cc(Cl)c(I)cc23)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.