Using O=C(Cl)CCl, Nc1c(I)c(C(=O)NCC(O)CO)c(I)c(C(=O)NCC(O)CO)c1I to produce O=C(CCl)Nc1c(I)c(C(=O)NCC(O)CO)c(I)c(C(=O)NCC(O)CO)c1I, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.