Using CCC(Br)c1[nH]c2cc(C(=O)OC)ccc2c1C(=O)C(C)C, CC(=O)[O-] to produce CCC(OC(C)=O)c1[nH]c2cc(C(=O)OC)ccc2c1C(=O)C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.