Using CCOC(=O)c1cc2c(CBr)ccc3c2n1CCCCC3=O, CC(=O)[O-] to produce CCOC(=O)c1cc2c(COC(C)=O)ccc3c2n1CCCCC3=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.