Using COC(=O)[C@H](Cc1cc(I)c(O)c(I)c1)NC(=O)OC(C)(C)C, OCCCBr to produce COC(=O)[C@H](Cc1cc(I)c(OCCCBr)c(I)c1)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.