Using COC(=O)c1cc(-c2ccccc2)c(O)c(-c2ccccc2)c1, CC(C)(C)OC(=O)CBr to produce COC(=O)c1cc(-c2ccccc2)c(OCC(=O)OC(C)(C)C)c(-c2ccccc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.