Using COC(=O)CCc1ccccc1OCCCCCBr, CCCc1c(O)ccc2c1OCC2=O to produce CCCc1c(OCCCCCOc2ccccc2CCC(=O)OC)ccc2c1OCC2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.