Using CCCOc1ccc2c(c1)C(c1ccc(OC)cc1O)C(C(=O)OC)C2c1ccc2c(c1)OCO2, OCCCBr to produce CCCOc1ccc2c(c1)C(c1ccc(OC)cc1OCCCO)C(C(=O)OC)C2c1ccc2c(c1)OCO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.