Using COc1cc(C(=O)CCC(=O)c2cc(OC)c(OC)c(OC)c2)cc(I)c1O, CCCBr to produce CCCOc1c(I)cc(C(=O)CCC(=O)c2cc(OC)c(OC)c(OC)c2)cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.