Using COC(=O)C(c1ccc2c(c1)OCO2)c1cn(C)c2ccc(Br)cc12 to produce Cn1cc(C(C(=O)O)c2ccc3c(c2)OCO3)c2cc(Br)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.