Using CCCc1c(O)ccc(C(C)=O)c1O, COC(=O)CCCCCCCCCCBr to produce CCCc1c(OCCCCCCCCCCC(=O)OC)ccc(C(C)=O)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.