Using BrCCC1OCCO1, COc1cc(OC)nc(Oc2ccccc2C(=O)O)n1 to produce COc1cc(OC)nc(Oc2ccccc2C(=O)OCCC2OCCO2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.