Using CC(=O)CNc1ncc(C(=O)OC(C)(C)C)c(Nc2ccc(Br)cc2Cl)c1Cl to produce Cc1cnc2c(Cl)c(Nc3ccc(Br)cc3Cl)c(C(=O)O)cn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.