Using CCOC(=O)c1ccc2cc(-c3cc(Br)c4c(c3)OCO4)ccc2c1 to produce OCc1ccc2cc(-c3cc(Br)c4c(c3)OCO4)ccc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.