Using Cc1oc(=O)oc1CBr, CCCCCCCCCCCCCCOc1ccc(C(=O)O)o1 to produce CCCCCCCCCCCCCCOc1ccc(C(=O)OCc2oc(=O)oc2C)o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.