Using OB(O)c1ccc2c(c1)OCO2, COC(=O)c1ccc(Br)cc1NC(=O)c1ccccc1 to produce O=C(Nc1cc(-c2ccc3c(c2)OCO3)ccc1C(=O)O)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.